Atomic Structure 1

Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common isotopes. If the abundance of ²³⁴U is 0.01%, the abundance of ²³⁵U is 0.71%, and the abundance of ²³⁸U is 99.28%, what is the average atomic mass of uranium?

• 100 amu

• 327.889amu

• 237.98 amu

• 240 amu

Calculate the average atomic mass of sulfur if 95.0% of all has a mass of sulfur atoms have a mass of 32.972 amu, 0.76% has a mass of 32.971 amu, and 4.22% has a mass of 33.967%.

• 32.1 amu

• 31.2 amu

• 13.2 amu

• 23.1 qmu

Which particle has a positive charge?

• electron
• orbital
• proton
• neutron

Choose the particle that has no charge.

• nucleus
• neutron
• proton
• electron

An electron has a _____ charge.

• negative
• positive
• neutral

Tags

NGSS.HS-PS2-4

Which particles make up the nucleus of an atom?

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

Tags

NGSS.MS-PS1-1

The particles of the atom you can find by knowing the atomic number.

• neutrons
• protons and electrons
• protons and neutrons
• atomic mass

Tags

NGSS.MS-PS1-1

What charge does the nucleus have and why?

• positive - the neutrons do not have a charge
• positive - the neutrons and protons are positively charged particles
• neutral - the neutral charge dominates the positive charge
• neutral - electrons cancel out the positive charge of the atom

Tags

NGSS.MS-PS1-1

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

• 5
• 8
• 6
• 10

Tags

NGSS.MS-PS1-1

An element with a mass number of 11 and an atomic number of 5 has how many neutrons?

• 11
• 5
• 6
• 16

Tags

NGSS.MS-PS1-1