Question

An element X belongs to group 1 and 3 period.

a. Give its electronic configuration

b. Formula when it combines with oxygen

c . State its nature (3)

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Answer 1

2 , 8 , 1 ( It should have 3 shells and 1 valence electron)

X2O ( Oxygen have valency 2 )

c It's nature will be basic..

Answer 2

Answer:

• The element will be sodium (Na)

Explanation:

Electronic configuration

• 1s²2s²2p63s1
• It combines with Na to form (NaO)
• It is a soft metal that can be easily fit with a knife