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3 years ago

Which element has four energy levels? Na,K,Cs,Rb

Chemistry

2 answers:

Ann [662]3 years ago

7 0

Potassium K

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Alik [6]3 years ago

6 0

Answer:

The correct option is: Potassium

Explanation:

Sodium, Potassium, Rubidium and Caesium are referred to as the alkali metals that belong to the group 1 of the periodic table, thus having one valence electron in their outer or valence shell.

Sodium, atomic number 11, belongs to the period 3 of the periodic table. It has three shells and the number of electrons per shell is 2, 8, 1.

Potassium, atomic number 19, belongs to the period 4 of the periodic table. It has four shells and the number of electrons per shell is 2, 8, 8, 1.

Rubidium, atomic number 37, belongs to the period 5 of the periodic table. It has five shells and the number of electrons per shell is 2, 8, 18, 8, 1.

Caesium, atomic number 37, belongs to the period 6 of the periodic table. It has six shells and the number of electrons per shell is 2, 8, 18, 18, 8, 1.

Therefore, Potassium, atomic number 19, has four shells or energy levels.

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What is the molecular formula of an empirical N2H3 if n=2? SHOW WORK!

aliya0001 [1]

A compound's empirical formula tells you what the smallest whole number ratio between the atoms that make up that compound is.

I think of the empirical formula as a building block for molecules. A compound's molecular formula will depend on how many building blocks are needed to build a molecule of a given substance.

In your example, you know that the empirical formula of the compound is

This tells you that the minimum ratio between nitrogen atoms and oxygen atoms is

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molecular formula

empirical formula

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You also know that the molar mass of your compound is

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This means that the molar mass of all the atoms that make up that molecule must add up to give

92 g/mol

So, how would you determine how many building blocks you need? Well, start by figuring out the molar mass of one building block, i.e. the molar mass of the empirical formula.

Since it contains one nitrogen atom and two oxygen atoms, you will get

14.0067 g/mol

15.9994 g/mol

46.0055 g/mol

So, if one building block has a molar mass of

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46.0055 g/mol

⋅

92 g/mol

g/mol

46.0055

g/mol

1.99976

≈

This means that the compound's molecular formula, which lists all the atoms that make up a molecule, will be

(

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→

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2 years ago

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DerKrebs [107]

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