period 3 elements in the Periodic Table have 3 electrons in there outher shell hence the name.
10
Calcium has 20 electrons
A period is a row in the periodic table of elements.
it is in group, 4 and in period 2 group means how many electrons in outer shell, and period means how many electron shells it has:)
Chlorine has 17 electrons. It is displayed as atomic number in periodic table.
Two valence electrons
7. It is in period 7, at the bottom of the periodic table.
Calcium has 20 electrons
A period is a row in the periodic table of elements.
Xenon has 54 electrons.
it is in group, 4 and in period 2 group means how many electrons in outer shell, and period means how many electron shells it has:)
Chlorine has 17 electrons. It is displayed as atomic number in periodic table.
Two valence electrons
Just so you know, the periodic table does not give any indication of how many electrons an atom has but 95% of sulfur atoms are neutral and so contain 16 electrons.
Horizontal rows are termed as periods. There are 7 periods in periodic table.
Periods are the horizontal rows in the periodic table of Mendeleev; this table contain 7 periods.
8 until you go lower down on the periodic table. (past period 3)
The period (row) indicates how many electron shells the element has and the family (column) indicates how many valence electrons the element has.