The chart lists the properties of some elements. Which element would you expect to find in group 18 of the periodic table?

• A

• B

• C

Tags

NGSS.HS-PS1-1

A neutral atom of Cobalt has an Atomic# of 27 and an Atomic Mass of 59. How many protons, electrons, and neutrons does this atom have?

• 27 protons, 59 electrons, and 86 neutrons

• 27 protons, 27 electrons, 32 neutrons

• 13 protons, 13 electrons, 14 neutrons

• 13 protons, 13 electrons, and 27 neutrons

Tags

NGSS.MS-PS1-1

If element x has 32 protons and 35 neutrons, what is the mass number?

• 14

• 32

• 67

• 3

Tags

NGSS.MS-PS1-1

An element’s atomic number is equal to its number of:

• Protons

• Electrons

• Protons and Neutrons

• Protons and Electrons

Isotopes of an element have different _____ therefore also have different _____. Choose the best choice for this question.

• neutrons, mass numbers

• protons, atomic numbers

• electrons, chemical properties

• neutrons, atomic numbers

Tags

NGSS.HS-PS1-8

What is the mass number of an element that has 18 protons, 18 electrons, and 20 neutrons?

• 18

• 20

• 36

• 38

Tags

NGSS.MS-PS1-1

What is the term for a repeating pattern?

• Metallic

• Isotopic

• Transition

• Periodic

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

When elements are neutral,

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

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

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

• All atoms contain neutrons which have no charge.

Tags

NGSS.MS-PS1-1

Valence electrons determine an atom’s ____.

• Mass

• Electric Charge

• Period

• Chemical Properties

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The number of energy levels filled in an atom is determined by which subatomic particles?

• Protons

• Neutrons

• Electrons

• Photons

Tags

NGSS.HS-PS1-1