Which of the following tend to react by losing 2 electrons?
a. noble gases
b. halogens
c. alkali metals
d. alkali earth metals

Option (D) is the correct answer.

Explanation:

Alkaline earth metals are group 2 elements and each element of this group contains two valence electrons.

For example, Magnesium is an alkaline earth metal and its electronic distribution is 2, 8, 2.

So, in order to attain stability magnesium will lose two electrons.

Whereas group 1 elements are known as alkali metals and they tend to lose only one electron in order to attain stability.

Noble gases are the elements that have completely filled orbitals. These are highly stable and therefore, they do not need to lose an electron.

Halogens are the elements that needs only one electron to completely fill their shell.

Thus, we can conclude that out of the given options alkali earth metals tend to react by losing 2 electrons.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation: