U1.7 Atomic Structure

What are subatomic particles?

• Atoms

• Protons, neutrons, and electrons

• Molecules

• Compounds

Tags

NGSS.MS-PS1-1

Fill in the blank: The three main subatomic particles in an atom are _______, _______, and _______.

• protons, neutrons, electrons

• protons, photons, electrons

• neutrons, electrons, positrons

• protons, neutrons, quarks

Tags

NGSS.MS-PS1-1

Fill in the blank: The ______ is the region at the center of an atom that contains most of the mass of the atom.

• nucleus

• electron cloud

• proton shell

• valence band

Tags

NGSS.MS-PS1-1

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

• Neutron

• Proton

• Electron

• Nucleus

A neutron is an ______ particle in the nucleus of an atom. Considered to have a mass of 1.

• uncharged

• positively charged

• negatively charged

• magnetic

Tags

NGSS.MS-PS1-1

What is an electron? An electron is a ________ charged particle that occupies the space in an atom outside the nucleus. Considered to have a mass of 0.

• negatively

• positively

• neutrally

• doubly

Tags

NGSS.MS-PS2-3

Do electrons orbit like planets?

• True

• False

Where are electrons most likely to be found?

• In the nucleus

• In a cloud around the nucleus

• Outside the atom

• In the proton

Fill in the blank: An electron cloud is mostly ________ space, with electrons existing as tiny individual particles at specific points within it.

• empty

• solid

• liquid

• dense

Electrons closer to the nucleus have​ (a)   energy and are more ​ (b)   attracted to it.

• more

• equal

• no

• less
• strongly
• weakly