Question

An element X (atomic no 17) reacts with an elements Y ( atomic no 20) to form compound.
a) Write the position of these elements in the Modern Periodic Table.
b) Write the formula of the compound formed.
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Answer 1

Answer:

x argon

y calcium

Explanation:

their reaction will give solid calcium chloride

Answer 2

Answer:

a) The position of element X in the modern periodic table is group 17 and period 3. The position of element Y in the modern periodic table is group 2 and period 4.

b) The formula of the compound formed is YX2.