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This atom has 2 valence electrons in it's sixth energy level
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
The atoms in a column on the periodic table all have
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
The atoms in the noble gas group are stable because
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
An example of a noble gas would be
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
The halogen group on the periodic table hold how many valence electrons
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
The atomic mass of an atom tells you
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
An electron has a
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
The rows on the periodic table are called
The number of protons plus the number of neutrons in the nucleus
Helium
Radium
The outer shells (energy levels) are full
periods
The same number of electrons in the last shell
Negative charge
7
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