p4 could stand for period 4, or for 4 electrons in one of the p orbitals.
11 is the atomic number for the element sodium in the periodic table.
Calcium.
water
Helium.
cerium
N stands for Nitrogen on the periodic table.
Beryilium
iodine
there is no such element
iodine
'h' doesn't mean anything in the Periodic Table. 'H' (Capital Letter) is hydrogen 'He' (Capital Letter followed by a lower case letter) is Helium. Careful with your use of capital/lower case letters. Follow as shown in the Periodic Table.
Argon is what Ar stands for on the Periodic Table of elements.
Sr stands for strontium on the periodic table of elements.
11 is the atomic number for the element sodium in the periodic table.
potassium
Beryllium (Be)
it is fluorine