Atomic Structure and Subatomic Particles

This particle determines the element's identity.

• electron
• proton
• neutron
• valence shell

Has a mass of about 1/2000th the mass of a proton. (we say it has ZERO mass)

• electron
• neutron
• nucleus
• electron cloud

Which particles make up the nucleus of an atom?

• protons and neutrons
• electrons and protons
• electrons, protons, and neutrons
• electrons and neutrons

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An element with a mass number of 10 and an atomic number of 6 has how many PROTONS?

• 16
• 8
• 6
• 10

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number?

• 20
• 10
• 5
• 25

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

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What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• the mass #

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Isotopes are atoms of the same element with  different numbers of _________________ .

• Protons
• Neutrons
• Electrons

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Elements are represented by chemical symbol.  Symbols are written with

• all lower case letters.
• all capital letters.
• always only one  letter.
• at least and ONLY one capital letter.

All matter is made of .....

• energy.
• atoms .
• air.
• chemistry.

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