atomic mass & number

Who invented the Periodic Table?

• Mendeleev

• Bohr

• Lewis

• Democritus

Mendeleev's genius was his ability to

• predict elements that were not discovered yet

• organize elements by their mass

• had an element named after himself

• organize elements by properties

The modern periodic table of elements is arranged by 

• Number of neutrons
• State of matter
• Atomic number
• Atomic Mass

Most of an atoms mass is made up in the nucleus from which two particles

• protons and electrons

• neutrons and electrons

• neutrons and protons

Tags

NGSS.MS-PS1-1

The Atomic number is known as the _______

• Number of electrons in an atom

• Number of Protons in an atom

• Number of neutrons in an atom

• Number of Protons and electrons in an atom

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What is the Atomic Number of this Element

• 7

• 3

• 4

• 1

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What is the Atomic Mass Number of the element mentioned above

• 12

• 6

• C

• 16

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What is the number of protons in Magnesium atom ?

• 12

• 24

• 23

• 8

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What is the number of electrons in chlorine atom ?

• 35

• 11

• 18

• 17

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NGSS.MS-PS1-1