The atomic number of an element is 19. [3marks]
(i)Write the electronic configuration of this element and determine
(a) the valency of this element and (b) whether this element is a metal or a non metal.
(ii)Write the formula of the oxide of this element.
(iii) Is this element more reactive than Na (atomic number 11) ? Justify your answer giving
example.
Answers
Answered by
0
Answer:
The Elements, sorted by Atomic Number
Atomic Number Symbol Atomic Mass (amu, g/mol)
17 Cl 35.453
18 Ar 39.948
19 K 39.0983
20 Ca 40.08
Answered by
2
Answer:
(1) .potassium is the element and E.C is 2,8,8,1
(a) valency of the element is 1 (b) the element is metal
(2) K2O
(3) Na is not more reactive than potassium
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