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We know that a neutral atom of bromine (Br) is larger than a neutral atom of magnesium (Mg) because


A.) group numbers tells us how many electrons orbitals surround a nucleus, bromine is in group 7A while magnesium is in group 2A

B.)period numbers tells us how many electron orbitals surround a nucleus, bromine is in period 4 while magnesium is in period 3

C.)atoms with many electrons are always larger than atoms with fewer electrons, a neutral atom of bromine has 35 electrons while neutral atom of magnesium has only 12.
D.) bromine and magnesium has very different physical and chemical properties.

Respuesta :

CrystalQueen
I would go with C.) 

More electrons take up more space and have more orbitals

Hope this helps!

Answer: Option (C) is the correct answer.

Explanation:

Bromine is a group 7A element with atomic number 35. Whereas magnesium is a group 2A element with atomic number 12.

This means that a neutral atom of bromine has more number of electrons as compared to a neutral atom of magnesium. Hence, size of a bromine atom will definitely be larger than the size of a magnesium atom.

Thus, we can conclude that we know that a neutral atom of bromine (Br) is larger than a neutral atom of magnesium (Mg) because atoms with many electrons are always larger than atoms with fewer electrons, a neutral atom of bromine has 35 electrons while neutral atom of magnesium has only 12.

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