Select the symbol of the element that fits each of the following descriptions: (a) The alkali metal

Question:

Select the symbol of the element that fits each of the following descriptions:

(a) The alkali metal in the fourth period 

(b) The halogen in the third period 

(c) The rare earth with the lowest atomic mass 

(d) The metal in Group VIIB/7 and Period 4.

Periodic Table:

N 4 15 6 Be 6.94 9.01 12 11 3 Na Mg 22.99 24.31 7 3 Li 19 1 IA K 39.10 37 55 4 2 IIA 87 Fr (223) 20 21 Sc

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