Question

1.Consider the following elements ;
Na, Ca, Al, K, Mg, Li
a.Which of these elements belong to the same period of the periodic table?Why?
b. Which of these elements belong to the same group of the periodic table? Why?
c.Which of these element form a trivalent cation?​

Answer 1

Answer:

(a) Na, Mg and Al belong to the same period of the periodic table and belong to the 3rd period.

(b) Li, Na and K belong to the same group of the periodic table and belong to the 1st group.

Answer 2

Answer:

a) Li,Na,K

because they have electron in outermost shell is 1 and these are called alkali metals.

b)same as (a)

c)"Al" because Aluminium has 3 electrons in outermost shell