How many moles of aluminum exist in 100.0 g of aluminum?

Answer:

[tex]1s^{2}2s^{2}2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]

Explanation:

For this exercise is necessary to know the atomic number of Se, which is 34 and indicate the numbers of electrons that has this atom.

For the electronic configuration you just need to follow the direction of the arrow indicated in the attached image, which shows the distribution of the electrons in the atomic orbitals, until complete the 34 electrons that has the selenium atom. The super index indicates the number of electrons in a specific atomic orbital. Then the electron configuration of selenium atom is:

[tex]1s^{2}2s^{2}2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10} 4p^{4}[/tex]

Answer:

Radioactive dating

Explanation:

An atom of aluminum with a mass number of 26 and an atomic number of 13 has a total of 13 protons and electrons  and 13 neutrons.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Final answer:

The term used to describe the capacity of long-term memory is 'unlimited' or 'limitless' due to its potentially infinite capacity for storing information for extended periods.

Explanation:

The term used to describe the capacity of long-term memory is unlimited or limitless. Long-term memory (LTM) is a type of memory storage that can hold information for extended periods, ranging from days to years. Long-term memory differs from short-term memory in that it possesses a potentially infinite capacity; there is no known limit to what we can remember. Although the ability to retrieve information from LTM can be affected by various factors, such as consolidation and interference, the storage capacity itself is considered vast.

the answer is 4.3.....

The raw result of 32.431914 m³ should be rounded to 3 significant figures. Therefore, it becomes 32.4 m³.

Identify Significant Figures:

Calculate the Raw Product:
The raw product of these measurements is 5.40 m x 3.21 m x 1.871 m = 32.431914 m³ (as given).

Determine Significant Figures for Final Answer:
When multiplying, the result should have the same number of significant figures as the measurement with the fewest significant figures. In this case, that is 3 significant figures (from 5.40 m and 3.21 m).

Answer is: 1 × 10⁻¹⁰ meter or 0.0000000001 meter.

The atomic radius is a measure of the size of the atom.

It is distance from the center of the nucleus of atom to the boundary of electron cloud.

The radius of atoms is between 30 and 300 pm (10⁻¹² m)  or between 0.3 and 3 angstroms (10⁻¹⁰ m). 

The radius generally decrease along each period of the Periodic table.

The atomic number of sulfur is 16. The electron configuration for an electronically neutral atom of sulfur is 1 s 22 s 22 p 63 s 23 p 5. The correct option is d.

The electronic configuration of an atom is the position of the electrons present inside the atoms. This process identified the position of electrons inside the atoms.

The different shells have different energy levels, and these energy levels are also reflected in the energy of electrons.

So, as the atomic number of sulfur is 16. If its electronic configuration is done. There will be 1 electron is the s orbital, 22 in s2 and 22 in the p orbital. The last orbital has 5 electrons.

Therefore, the electron configuration for an electronically neutral atom of sulfur is 1 s 22 s 22 p 63 s 23 p 5. The correct option is d.

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Density of the given sample is 10.50 g /cm³ which is the density of silver.

Density  of a substance is it's mass per unit volume.It is denoted by capital letter 'D'.It has SI unit of kg/m³.For a pure substance, density has numerical value which is same as it's mass.

Different materials have different densities  which is  found to be relevant to substance's purity and packaging.Osmium and Iridium are densest known elements.

Density is an intensive property because there is a narrow range of densities across the samples. It does not change with respect to the initial mass .It shows how much mass of substance is present in given amount of volume.

For the mentioned data, density is calculated as,mass/volume

which is 25/2.38=10.504 g/cm³

10.504 g/cm³ is the density of silver and hence the sample is of silver.

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The elements 90 to 103 on the periodic table are called the Actinide series. They are part of the 'f-block' and are all radioactive. Some well-known actinides are Uranium and Plutonium.

The elements numbered 90 to 103 on the periodic table are known as the Actinide series. These elements, which include Th (Thorium, 90) to Lr (Lawrencium, 103), are part of the 'f-block' and are often shown separately from the main body of the periodic table.

It is important to note that all of the actinides are radioactive, and some are not naturally occurring but synthesized in laboratories. The most well-known of these is probably U (Uranium, 92) and Pu (Plutonium, 94), commonly used in nuclear reactors and weapons.

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The electron configuration of copper cation:

₂₉Cu²⁺ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹ or [Ar] 3d⁹.

The electron configuration of copper cation:

₄₇Ag⁺ 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ or [Kr] 4d¹⁰.

Copper and silver lose their outer s-orbital electrons before they lose their outer d-orbital electrons.

Each electron configuration is consistent with the color, copper solution is blue, silver solution is colorless.

The electron configuration of Cu²⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁹. The electron configuration of Ag⁺ is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰.

The observed color of Cu²⁺ is typically blue, while the observed color of Ag⁺ is colorless. The electron configurations of these cations are consistent with their observed colors.

Electronic configuration refers to the arrangement of electrons in an atom, ion, or molecule. It describes the distribution of electrons among different energy levels, orbitals, and subshells within an atom or ion.

The electronic configuration is represented using a notation that indicates the energy levels (principle quantum numbers), subshells (s, p, d, f), and the number of electrons in each subshell. The Aufbau principle, Pauli exclusion principle, and Hund's rule are used to determine the order of filling the orbitals and the spin states of the electrons.

Cu²⁺ has an incomplete d-orbital with 9 electrons, which gives rise to a blue color due to the absorption of light in the visible spectrum. The absorption of light corresponds to the promotion of an electron from a lower energy d-orbital to a higher energy level.

On the other hand, Ag⁺ has a fully filled d-orbital with 10 electrons, which does not result in the absorption of visible light. As a result, Ag⁺ appears colorless.

The observed colors of Cu²⁺ and Ag⁺ ions are a result of the electronic configuration and the interaction of light with the d-electrons in the transition metals.

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Answer:

The macroscopic appearance is different.

Explanation:

The two (solution) and heterogeneous mixture are actually mixtures. These are made up of one of two pure substances in gaseous and liquid phases.

However, the difference lies in the macroscopic level of the particles.

A heterogeneous mixture is made of different substances. For example, when powdered milk is added to water, the mixture is a white substance, or colloidal mixture. The mixture is a heterogeneous in the sense that is all liquid; however, the mixture is not the same color as water. Thus, there is not complete dissolution.  

A solution is the same throughout. An example is dissolving sugar into water. The solution is colorless throughout. The difference is that the sugar and water have formed a solution whose properties are not visible to the naked eye.

TRUE is the perfect answer

Final answer:

Sodium ion and potassium ion are the two ions that are most likely to bond due to their positive charges.

Explanation:

The two ions that are most likely to bond are sodium ion and potassium ion. Both sodium and potassium are alkali metals in Group 1 of the periodic table and have a single electron in their outermost energy level. When they lose this electron, they form positively charged ions (cations). Since sodium has a +1 charge and potassium has a +1 charge, these ions are attracted to each other through electrostatic forces, forming a bond.

Jupiter and Saturn contain the highest proportions of hydrogen compounds. They are primarily composed of hydrogen and helium with hydrogen being the dominant element, and their atmospheres house several hydrogen-based gases and complex hydrocarbons.

The two Jovian planets that contain the highest proportions of hydrogen compounds are Jupiter and Saturn. These planets, known as the gas giants of our solar system, consist primarily of hydrogen and helium, with hydrogen being the more abundant element. Jupiter and Saturn's high gravitational force has compressed the gases in their interior until the hydrogen becomes a liquid, earning them the often misleading label of 'gas planets'.

However, the bulk of both planets consists of compressed, liquefied hydrogen, so they could more accurately be referred to as 'liquid planets'. This hydrogen-rich composition has influenced the chemistry of the outer solar system. Subsequently, the atmospheres of these planets are heavily populated with hydrogen-based gases such as methane (CH4) and ammonia (NH3), or more complex hydrocarbons.

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