Question

Element "A" belongs to 3rd period and group 1 of the Modern Periodic table.
i) What is the atomic number of the element ?
ii) Which element in the same period has same valency as element A?
iii) Which element in the group is not metal?
iv) Which metal in the group is least reaction ?
v) Write the formula of the compound formed by “A” with the most reactive non metal of the
period.​

Answer 1

Element is sodium with atomic number11
Same valency is of chlorine but of opposite sign
Hydrogen
Lithium
Francois