Unit 3- Atoms & Nucleus Study Guide

For a neutral atom of Potassium with 20 neutrons:

Protons = __, Electrons =__, Atomic Number = __, and Mass Number = __

(type your answers in the boxes in order)

Tags

NGSS.MS-PS1-1

For a neutral atom of an element with 17 protons and a mass number of 35:

Element Name = , Neutrons = __, Electrons =__, Atomic Number = __

(type your answers in the boxes in order)

Tags

NGSS.HS-PS1-1

How many electrons are in a neutral atom of bromine?

Mathematical Equivalence

ON

Tags

NGSS.HS-PS1-1

How many electrons would you expect to be in a neutral atom of xenon?

Mathematical Equivalence

ON

Tags

NGSS.HS-PS1-1

Scandium is an element that normally has 23 neutrons in its nucleus. How many electrons would you expect a neutral atom of Scandium to have?

Mathematical Equivalence

ON

Tags

NGSS.HS-PS1-1

Why do atoms of elements have neutral charges?

• All atoms contain neutrons which have no charge.

• The number of protons and the number of neutrons are equal.

• The number of protons and the number of electrons are equal.

• The number of neutrons and the number of electrons are equal.

Tags

NGSS.HS-PS1-7

Which of the following properties of atoms can be used to identify an atom?

• Its number of valence electrons

• Its number of protons

• Its number of neutrons

• Its combined number of protons and neutrons

Which of the following statements is always true about ions?

• They have the same number of protons and electrons

• They have the same number of electrons and neutrons

• They have a different number of protons and electrons

• They have a different number of electrons and neutrons

Which statement about the atomic nucleus is correct? Select all that apply.

• The nucleus is made of protons and neutrons and has a positive charge.

• The nucleus is made of protons and neutrons and has a neutral charge.

• The nucleus contains almost all the mass of an atom

• The nucleus is far smaller than the area occupied by the electrons that orbit it

What type of nuclear reaction does the figure represent?

• Gamma decay

• Beta decay

• Nuclear fission

• Nuclear fusion

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8