Which one is comprised of the other three? (For example, if you choose proton then you are stating that a proton is made up of an atom, an electron and a neutron.)

• proton
• atom
• electron
• neutron

Tags

NGSS.MS-PS1-1

An atom always has a net charge that is __ because the charge of the protons __.

• positive; is greater than the charge of the electrons.
• negative; is less than the charge of the electrons.
• neutral; cancels out the charge of the neutrons.
• neutral; cancels out the charge of the electrons.

Tags

NGSS.HS-PS1-7

What is the number of protons in an atom of iron-56?

• 26
• 53
• 56
• 77

Which is the correct symbol for the atom with 42 protons and 49 neutrons?

• 
• 
• 
• 

Which is the number of neutrons in ____?

• 35
• 45
• 80
• 115

Tags

NGSS.HS-PS1-8

Which is the number of protons in ____?

• 35
• 45
• 80
• 115

Which is the mass number ____?

• 35
• 45
• 80
• 115

Tags

NGSS.HS-PS1-7

NGSS.HS-PS1-8

According to the modern concept of the atom, which are located in the nucleus of an atom?

• electrons and protons
• neutrons and electrons
• protons only
• protons and neutrons

Tags

NGSS.HS-PS1-8

All atoms of a single element have the same ___.

• mass
• number of neutrons
• number of protons

The atomic mass unit (amu) is defined as __.

• zero
• 1/12th the mass of a carbon-12 atom
• 1/100th the mass of a helium-4 atom
• the average atomic mass of a hydrogen-2 atom