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3 years ago

What element has 4 valence electrons and 5 electron shells?

Chemistry

1 answer:

marta [7]3 years ago

8 0

Answer: Tin (Sn)

Explanation: The electron configuration for tin (Sn) is shown in the picture. It's last electrons are:

5s^2 4d^10 5p^2

The valence electrons are in the 5th electron shell and include 2 each in the 5s and 5p orbitals.

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Approximately how many particles are in 2 moles?

schepotkina [342]

Answer:

$1.2\times10^2^4$ particles in 2 moles.

Explanation:

The number of particles that are contained in one mole, the international unit of amount of substance: by definition, exactly 6.022×10²³, and it is dimensionless. It is named after the scientist Amedeo Avogadro.

It is also known as Avogadro's constant.

∴ Number of particles in one mole = $6.022\times10^2^3$

∴ Number of particles in 2 mole = 2 times Number of particles in one mole

∴ Number of particles in 2 mole= $2\times6.022\times10^2^3=12.044\times10^2^3\approx1.2\times10^2^4$

Hence there are $1.2\times10^2^4$ particles in 2 moles.

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Veseljchak [2.6K]

Answer:

30 positive charged protons

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When sugar dissolves in water are covalent bonds broken?

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3 years ago

Why is it important to have the International System of Units?

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A solution of HCl has a concentration of 1.20 x 10-2 M. What is the pH of this solution?

Westkost [7]

-log (1.2x10^-2) = 1.92 so C

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