The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Sodium (Na) is found in period 

• 3
• 2
• 4
• 1

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Sodium (Na) is found in group 

• 1
• 2
• 3
• 4

What does the atomic mass tell you? 

• Basically,the number of electrons and protons
• The number of neutrons
• Basically, the number of protons and neutrons
• The number of protons.

The atomic number tells you what?  READ THE ANSWERS CAREFULLY

• only the number of electrons
•  only the number of protons
• only the number of neutrons
• the number of both electrons and protons in an atom.

The horizontal (side to side) rows in the Periodic Table are called

• groups

• families

• periods

• atomic numbers

what is the name of group number 2

• transition metals

• halogens

• metaloids

• alkaline earth

what group number are the halogens

• 18

• 1

• 2

• 17

An element's identity is determined by the number of

• electrons.
• protons.
• neutrons.
• valence.

Most of the mass of an atom is found it its _____.

• electron cloud
• nucleus
• atomic number
• empty space

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