Atomic Structure Valence Electrons Periods and Groups Counting Atoms

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?

• 5
• 8
• 6
• 10

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How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

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A positively charged particle found in the nucleus of the atom

• Proton
• Electron
• Neutron

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The negative charge particles that float around the outside of the atom

• Proton
• Neutron
• Electron

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What are valence electrons?

• electrons on the first shell

• nucleus

• the outermost shell

• the electrons on the outermost shell (energy level)

The subatomic particle that determines the identity of an element.

• neutron
• proton
• electron
• outer shell

What is the mass number and name of an element with 8 protons and 8 neutrons?

• 16 - Carbon
• 16 - Oxygen
• 24 - Oxygen
• 8 - Neon

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Most of the mass of an atom is contained here.

• electron orbitals 
• nucleus
• shells
• atomic #

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

• 14
• 7
• 15
• 18

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NGSS.MS-PS1-1