Question

Which of the following atoms contains seven valence electrons?
carbon
iodine
hydrogen
helium

I believe it's Iodine, but I just need a second person to confirm this.

Answer 1

yes its iodine while carbon contain 4electron hydrogen contain 1 electron and helium contain 2electron

Answer 2

in iodine u see its in 17group mean 7electron
Hydrogen in 1group mean 1 electron
helium is an exception it contain 2electron and kept in 17group
carbon contian 4 electron as it is kept in 14 group

Answer 3

elements are classified in different groups according to valence electrons. A second group element will have 2 electrons in its outer most shell

Answer 4

oh see past the 10s in the groups i was having trouble finding out the amount of electrons because they never have higher numbers like that for answers. thanks for explaining it heena. and thanks hashsam.