Unstable Nuclei

Over what range is the strong nuclear force attractive?

• greater than 3 fm

• 0.3 fm to 0.5 fm

• 0.5 fm to 3 fm

• less than 0.5 fm

In beta-plus decay...

Select ALL correct answers

• the mass number decreases by 1

• the mass number does not change

• the mass number increases by 1

• the atomic number decreases by 1

• the atomic number increases by 1

Tags

NGSS.HS-PS1-8

What is likely to happen to unstable nuclei with too many, or too few, neutrons?

• They will decay by emitting radiation.

• They will loose all their electrons.

• They will bond with other atoms.

Tags

NGSS.HS-PS1-8

Which sequence of radioactive emissions results in the formation of an isotope of the original element?

• one α particle and one β⁻ particle

• one α particle and two β⁻ particles

• two α particles and one β⁻ particle

• two α particles and two β⁻ particles

Tags

NGSS.HS-PS1-8

Complete the nuclear reaction

₈₅²⁰⁹At = ___ + ₂⁴He

• ₈₃²⁰⁵Bi

• ₈₆²⁰⁹Rn

• ₈₁²⁰⁷Tl

• ₈₅²⁰⁸At

Tags

NGSS.HS-PS1-8

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

Which subatomic particle determines the identity of an element?

• protons

• neutrons

• electrons

What is radioactive decay?

• An unstable nucleus breaks down to become more stable, giving off radiation

• An unstable atom breaks down to become more stable, giving off radiation

• An unstable element breaks down to become more stable, giving off radiation

• An unstable compound breaks down to become more stable, giving off radiation

Tags

NGSS.HS-PS1-8

What is the strong force responsible for?

• Beta decay

• Holding protons and neutrons together

• Holding planets in orbit

• Specific charge

How do the atomic number and mass number of a nucleus change during beta decay?

• The atomic number decreases by 1 and the mass number decreases by 1

• The atomic number increases by 1 and the mass number increases by 1

• The atomic number increases by 1 and the mass number remains constant.

• Neither changes

Tags

NGSS.HS-PS1-8