Refer to the periodic table and select the symbol of the element that fits each of the

Question:

Refer to the periodic table and select the symbol of the element that fits each of the following descriptions.

(a) The third–period alkali metal 

(b) The third–period alkaline earth metal 

(c) The rare earth element with the highest atomic mass 

(d) The lanthanide that is radioactive.

Periodic Table:

2 3 4 10 6 3 7 11 Li 6.94 1 IA Na 22.99 19 37 5 Rb K 39.10 al 55 4 87 2 IIA Fr (223) Be 9.01 12 Mg 24.31 Sr

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