What are some properties that different substances can have?

• They can reflect light differently.

• They can all be gases.

• They all have the same color.

• They all remain solid at any temperature.

Tags

NGSS.MS-PS1-2

What is the smallest unit of an element that retains its properties?

• Molecule

• Atom

• Proton

• Electron

Which of the following is NOT an element?

• Carbon

• Lead

• Gold

• Water

What does the symbol 'Au' represent in the periodic table?

• Silver

• Aluminum

• Argon

• Gold

What defines the element of an atom?

• Number of electrons

• Number of neutrons

• Number of protons

• Number of molecules

What is the atomic number of carbon?

• 6

• 14

• 8

• 12

What particles are found in the nucleus of an atom?

• Protons and neutrons

• Neutrons and electrons

• Only protons

• Protons and electrons

What charge do electrons have?

• No charge

• Neutral

• Negative

• Positive

Tags

NGSS.MS-PS2-3

Why do electrons not fly away from the nucleus?

• Because they are bound by neutrons

• Because they are neutral

• Because they are attracted to the positive charge of protons

• Because they are heavier than protons

Tags

NGSS.MS-PS2-5

What happens if an atom loses an electron?

• It becomes a different element

• It remains neutral

• It becomes positively charged

• It becomes negatively charged