PS.8.1.2 Atomic Structure (Difficult)

A student models an atom with 6 protons, 6 neutrons, and 6 electrons. Which conclusion is most accurate?

• The atom is negatively charged

• The atom is unstable

• The atom is neutral

• The atom is a molecule

Tags

NGSS.MS-PS1-1

Why do electrons have less effect on the atom’s mass than other particles?

• Electrons are heavier than protons

• Electrons are located in the nucleus

• Electrons have almost no mass

• Electrons carry a positive charge

A teacher shows a diagram of an atom with a positive center and electrons moving around it. What does the diagram best represent?

• A molecule made of elements

• An ion formed by reactions

• A neutral atom with a nucleus

• A solid substance with energy

A student removes one electron from a neutral atom. What is the result?

• The atom becomes negative

• The atom becomes an isotope

• The atom becomes an ion with a positive charge

• The atom becomes a compound

A neutral atom has 8 protons and 8 electrons. If it gains two electrons, what is its new charge?

• +2

• –2

• 0

• +8

Why are protons and neutrons found in the nucleus instead of the electron cloud?

• They move faster than electrons

• They are too small to move

• They are heavier and held together by strong forces

• They are chemically reactive

A diagram shows protons and neutrons grouped tightly at the center. Electrons are scattered outside. What is the function of the electrons in this atom?

• Add mass

• Define the element

• Control reactivity

• Stabilize the nucleus

Why is the nucleus considered the most massive part of the atom?

• It contains all the electrons

• It includes protons and neutrons

• It is larger than the atom itself

• It moves faster than the shells

Which statement explains why the number of protons determines the element?

• Protons give atoms their charge

• Every atom has the same number of protons

• The number of protons is unique to each element

• Protons are the most visible particles

A scientist builds a model with 3 protons, 4 neutrons, and 3 electrons. Which is the correct identity and charge of the atom?

• Lithium, neutral

• Beryllium, positive

• Helium, negative

• Boron, neutral

Tags

NGSS.MS-PS1-1