EMS and Atomic Mass

The mass number of an element that has 18 protons, 18 electrons, and 19 neutrons is _____.

• 19
• 18
• 36
• 37

How many neutrons does uranium-239 have?

• 92
• 147
• 239
• 331

Which statement about subatomic particles is true?

• Protons, neutrons, and electrons all have about the same mass.
• Unlike protons or neutrons, electrons have no mass.
• Neutrons have no charge and no mass.
• An electron has far less mass than either a proton or neutron.

Two isotopes of carbon are carbon-12 and carbon-14.  These isotopes differ from one another by two protons.

• true
• false

Changing the number of neutrons in an atom changes its...

• element type.
• mass.
• charge.
• atom type.

Tags

NGSS.MS-PS1-1

How many protons, neutrons, and electrons does an atom of Iodine-131 have?

• p=131, n=131, e=131
• p=53, n=131, e=53
• p=131, n=53, e=131
• p=53, n=78, e=53

Which particle has a positive charge?

• electron
• orbital
• proton
• neutron

Choose the particle that has no charge.

• nucleus
• neutron
• proton
• electron

Tags

NGSS.MS-PS2-3

This particle determines what element you have - the elements identity.

• electron
• proton
• neutron
• valence shell

This causes the mass of the nucleus to increase.

• adding an electron
• adding a neutron
• more orbitals
• adding negatively charged particles