Atomic

An atom with 19 protons, and 19 electrons and a mass of 39 has how many neutrons?

• 19

• 39

• 20

• 58

Tags

NGSS.MS-PS1-1

What is the name of this element?

• Helium

• Hydrogen

• Argon

• Silver

Tags

NGSS.MS-PS1-1

Look at this picture of Argon off the periodic table. Which of the following is true for this element?

• 18 protons

• 40 protons

• 22 protons

• 21.9 protons

Tags

NGSS.MS-PS1-1

Which part of an atom is used to identify it?

• number of protons

• number of neutrons

• number of electrons

The atomic mass of an atom is equal to

• number of protons plus number of neutrons

• number of protons plus number of electrons

• number of electrons plus the number of neutrons

The nucleus of an atom is made of

• electrons and protons

• electrons and neutrons

• protons and neutrons

• empty space

Outside the nucleus of an atom are these

• protons

• neutrons

• quarks

• electrons

Which of these phrases best describes an atom?

• a positive nucleus surrounded by a hard negative shell

• a positive nucleus surrounded by a cloud of negative charges

• a hard sphere with postive and negative charges on the outside

• a negative nucleus surrounded by protons and neutrons

Tags

NGSS.MS-PS1-1

What is true about an atom?

• Most of the space in an atom is taken up by the nucleus

• Atoms are mostly empty space

• Atoms have no mass

• Electrons have much more mass that protons or neutrons.

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks