Atoms

Experiments with cathode rays led to the discovery of the

• electrons
• nucleons
• protons
• neutrons

Isotopes are atoms of the same element that have different

• masses
• # of protons
• # of electrons
• chemical properties

Tags

NGSS.HS-PS1-8

All atoms of the same element have the same

• atomic mass
• mass number
• number of neutrons
• atomic number

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is

• 13
• 14
• 27
• 40

Tags

NGSS.MS-PS1-1

Where are electrons of an atom found?

• Nucleus
• Electron Cloud
• Some are in the nucleus and some in the electron cloud.
• They are moving everywhere.

Which of the following is a positively charged subatomic particle found in the nucleus of an atom?

• Electron
• Proton
• Neutron
• Quark

What carries no charge 

• Neutrons
• Electrons
• Protons

How many Protons are in one atom of Lithium?

• 3
• 6
• 7
• 6.941

Tags

NGSS.MS-PS1-1

Which is the smallest?

• electron
• proton
• atom
• neutron 

An atom has 5 protons and 7 neutrons. What is the mass number of the atom?

• 5
• 7
• 2
• 12