Atoms and Elements

Which of the following best describes an atom?

• protons and neutrons grouped together
• protons and electrons grouped together
• a core (center) of protons and neutrons surrounded by electrons
• a core of electrons and neutrons surrounded by protons

Tags

NGSS.MS-PS1-1

Which of the following is found farthest from the center of an atom?

• nucleus
• proton
• neutron
• electron

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)

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

Which of the following identifies the number and location of protons in a Sulfur atom (S)?

• 32 protons, located in the nucleus
• 16 protons, located in the nucleus
• 32 protons, located outside the nucleus
• 16 protons, located outside the nucleus

What makes an atom have a positive charge?

• more electrons than protons
• more neutrons than electrons
• more protons than electrons
• less protons than electrons

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

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