Which one is group 1A . A 11, 55 B 19,87 C 3,87 D All

1.	Which one is group 1A . A 11, 55 B 19,87 C 3,87 D All
Answer» Answer: all Explanation: by knowing ATOMIC NUMBER or you can DRAW electronic configuration and see that last ELECTRON should ENTER s sub shell

Answer»

Answer:

all

Explanation:

by knowing ATOMIC NUMBER or you can DRAW electronic configuration and see that last ELECTRON should ENTER s sub shell

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