Which of the following groups in the periodic

table contain elements so reactive that they are

never found in the free state?

(1) 1 and 2

(3) 2 and 15

(2) 1 and 11

(4) 11 and 15

Question

Chemistry

Rivers

4 July, 02:29

Which of the following groups in the periodic

table contain elements so reactive that they are

never found in the free state?

(1) 1 and 2

(3) 2 and 15

(2) 1 and 11

(4) 11 and 15

+3

Answers (1)

Know the Answer?

Regina Gentry · Answer 1

Elements of Group 1 and group 2 in the periodic table contain elements so reactive that they are never found in the free state

Explanation:

The metals in group 1 of periodic table consisting of 'alkali metals' which include lithium, potassium, sodium, rubidium, Francium and caesium. They are highly reactive because they have low ionisation energy and larger radius. The group 2 metals consist of 'alkaline earth metals' which include calcium, strontium, barium, beryllium, radium and magnesium. These alkaline earth metal have + 2 oxidation number, hence are highly reactive.

These both group metals are mostly reactive and so are never found in a free state. When they are exposed to air they would immediately react with oxygen. Hence, are stored in oils to avoid oxidation.

Which of the following groups in the periodictable contain elements so reactive that they arenever found in the free state?(1) 1 and 2(3) 2 and 15(2) 1 and 11(4) 11 and 15

Which of the following groups in the periodic

table contain elements so reactive that they are

never found in the free state?

(1) 1 and 2

(3) 2 and 15

(2) 1 and 11

(4) 11 and 15