Category 1 STAAR Review

What is the mass number of a potassium (K) atom that has 20 neutrons?

• 18

• 19

• 20

• 39

Which characteristics of PROTONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

Which characteristics of NEUTRONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

Which characteristics of ELECTRONS correctly complete the chart?

• Neutral/ Nucleus/ 1

• Positive/ Nucleus/ 1

• Negative/ Electron Cloud/ 0.0005

Tags

NGSS.MS-PS1-1

NGSS.MS-PS2-3

Electrons in the outermost shell of the electron cloud. They determine reactivity.

• Electron Cloud

• Electron

• Valence Electron

• Isotope

Tags

NGSS.MS-PS1-1

Substance that cannot be broken down into simpler substances.

Ex. Hydrogen, Oxygen, Helium

• Elements

• Isotope

• Neutrons

• Electrons

Center of the atom that contains protons and neutrons. Most of the mass of the atom with an overall positive charge.

• Electron Cloud

• Nucleus

• Isotope

• Elements

Tags

NGSS.MS-PS1-1

Positively charged particles in the nucleus of an atom.

• Protons

• Neutrons

• Electrons

• Isotope

Tags

NGSS.MS-PS1-1

Outside the nucleus of the atom where electrons are found. Largest part of the atom, but least massive. Overall negative charge.

• Nucleus

• Elements

• Electron Cloud

• Protons

Tags

NGSS.MS-PS1-1

Negatively charged particle.

• Proton

• Neutron

• Electron

• Isotope

Tags

NGSS.MS-PS1-1