Atomic Structure Review

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Subatomic particles with a positive charge

• neutrons
• atomic mass
• protons
• isotopes

Measure mainly of the nuclear particles: protons + neutrons

• Subatomic Particles
• Atomic Number
• Atomic Mass
• Gluons

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons

What is the atomic number?

• 35

• 18

• 17

• 52

How many protons and electrons does this element have?

• 35

• 18

• 17

• 52

What number indicates an electron?

• 1
• 2
• 3
• 4

All matter is made of 

• energy 
• atoms 
• air
• chemistry

Sodium has an atomic number of 11, how many protons does this atom have?

• 22
• 11
• 12
• 2

Answer explanation

The smaller number is the atomic number and it is the number of protons in the nucleus.

24.1% of all the isotopes of a an element have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu.
What is the average mass of this element?

• 74.92 amu
• 24.97 amu
• 75.01 amu
• 74.51 amu