Magnesium (mg) reacts explosively with oxygen (o2) gas. which of these elements is most likely to react with oxygen in a similar way? manganese (mn) calcium (ca) bromine (br) sulfur (s) aluminum (al)

calcium (Ca)

Explanation:

The element most likely to react with oxygen explosively is calcium. Calcium and magnesium are in the same group . Both of them are in group 2 . The electron configuration of magnesium and calcium are as follow;

Magnesium has an atomic number of 12 and can be represented as 2 8 2 .

or     1s2 2s2 2p6 3s2

Calcium has an atomic number of 20 and can be represented as 2 8 8 2.

or  1s2 2s2 2p6 3s2 3p6 4s2

Notice both of them have valency electron of 2. Both can easily go into a reaction as they lose the 2 electron to attain the octet rule.

Most group 2 elements react explosively with Oxygen and are usually reactive. Group 2 elements are also known as Alkali earth metals.

3.2x10^7

305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures