The existence of atoms was discovered...

• by one scientist

• by two scientists

• by many scientists over hundreds of years

• quickly over a thousand years ago

Scientists know the structure of the atom exactly because they have seen atoms under a microscope.

• True

• False

Which particles have a negative charge?

• protons

• neutrons

• electrons

• all of the particles

Tags

NGSS.MS-PS2-3

Inside the nucleus you will find:

• Protons and neutrons

• Protons and electrons

• Electrons and neutrons

• Only electrons

Tags

NGSS.HS-PS1-8

Using the image of carbon from the periodic table, find how many protons carbon has.

• 6 protons

• 12 protons

• 18 protons

• There's no way to know

Tags

NGSS.HS-PS1-1

The atomic number of an element is the same as its...

• number of electrons

• number of neutrons

• number of protons

What determines an atom's identity?

• Number of protons

• Number of neutrons

• Number of neutrons

• Protons + Neutrons

The mass of an atom comes from...

• its protons only

• neutrons only

• electrons only

• protons + neutrons

What is an isotope?

• An atom with a different number of electrons

• An atom with a different number of protons

• An atom with a different number of neutrons

What is true about this model of the atom?

• This model is totally useless and incorrect

• This model is useful but not perfect

Tags

NGSS.HS-PS1-1