period 3 elements in the Periodic Table have 3 electrons in there outher shell hence the name.
Calcium has 20 electrons
There are 2 elements in the first period of the periodic table: Hydrogen and Helium.
Chlorine has 17 electrons. It is displayed as atomic number in periodic table.
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.
Calcium has 20 electrons
Elements 114, 116, and 118 are in period 7 of the periodic table, so they will have 7 outer level electrons. Each period in the periodic table represents the number of electron shells an atom has, and the elements in the same period will have the same number of outer level electrons.
7. It is in period 7, at the bottom of the periodic table.
The d block of the periodic table contains 10 valence electrons.
There are 2 elements in the first period of the periodic table: Hydrogen and Helium.
Xenon has 54 electrons.
Chlorine has 17 electrons. It is displayed as atomic number in periodic table.
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.
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.
There are 32 elements in the 6th period of the periodic table.
8 until you go lower down on the periodic table. (past period 3)