How many valence electrons do the alkaline earth metals have? O A. 6
O B. 2
O C. 4
O D. 8

Explanation:

Alkaline earth metals are in group 2. The number of valence electrons of elements in group 2 is 2.

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Option B. 2.

Alkaline earth metals consist of elements in group 2A of the periodic table, which contain 2 valence electrons.

the volume increases

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.