Unit 1 Review

Naturally occurring silicon consists of 3 isotopes, Si-28, Si-29 and Si-30, whose atomic masses are 27.9769, 28.9765 and 29.9738 respectively. The most abundant isotope is Si-28 which accounts for 92.23% of naturally occurring silicon. Given that the average atomic mass of silicon is 28.0855, calculate the percentage abundance of Si-29.

• 4.67%
• 95.33%
• 12.22%
• 87.78%

What subatomic particles would you find in the nucleus of an atom?

• Protons only
• Protons and Neutrons
• Neutrons and Electrons
• Protons and Electrons 

Tags

NGSS.HS-PS1-8

What subatomic particle is electrically neutral (no charge)?

• Proton
• Ion
• Neutron
• Electron

What subatomic particle(s) would be found orbiting the nucleus?

• Neutrons only
• Electrons only
• Protons and Neutrons
• Protons and Electrons

Which subatomic particles are used to determine the atomic mass?

• Protons, Neutrons, Electrons
• Protons only
• Protons and Electrons
• Protons and Neutrons

Electrons have this type of charge

• negative
• positive
• neutral

Tags

NGSS.HS-PS2-4

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

• 14
• 7
• 15
• 18

Tags

NGSS.HS-PS1-1

An atoms overall charge is 

• positive 
• depends on its mood 
• neutral 
• negative 

What is the atomic number?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Tags

NGSS.HS-PS1-7

What is the atomic mass?

• the number of protons
• the number of protons and neutrons
• the number of neutrons
• the number of protons and electrons

Tags

NGSS.HS-PS1-8