Atoms & Elements

Use your periodic table to answer the following question.
Which of the following atoms has 14 electrons?

• Carbon (C)
• Silicon (Si)
• Sulfur (S)
• Argon (Ar)

Use the picture of an atom below to answer the question.

Which statement best describes the part of the atom that is shown by the letter B?

• It is an electron, and it has a negative charge.
• It is an electron, and it has a positive charge.
• It is a proton, and it has a negative charge.
• It is a neutron, and it has a neutral charge.

Tags

NGSS.MS-PS1-1

Cobalt (Co) has 27 protons in each atom. Based on this information, which of the following also describes an atom of Cobalt?

• It has no neutrons.
• It has 27 electrons.
• It has 13 neutrons and 14 electrons.
• It has a total of 86 neutrons and electrons.

Tags

NGSS.MS-PS1-1

An element with an atomic number of 37 and an atomic mass of 85 has how many neutrons in each atom?

• 37
• 48
• 85
• 122

Tags

NGSS.MS-PS1-1

An atom has 54 protons, 54 electrons, and 131 neutrons. What is the atomic number of the atom?

• 54
• 77
• 131
• 185

Tags

NGSS.MS-PS1-1

How many protons and neutrons are there in an atom of Gallium (Ga)?

• 31 protons and 31 neutrons
• 31 protons and 70 neutrons
• 31 protons and 39 neutrons
• 31 protons and 101 neutrons

Tags

NGSS.HS-PS1-8

The protons in an atom’s nucleus have what kind of charge?

• positive
• negative
• neutral
• no charge

What kind of charge do neutrons have?

• positive 
• negative
• neutral
• -3

What is the basic unit of matter (smallest part of an element)?

• atoms
• elements
• protons
• compounds

Tags

NGSS.5-PS1-1

• Periods
• Groups