Atoms

What does the nucleus consist of?

• Protons + Electrons
• Neutrons + Electrons
• Atoms
• Protons + Neutrons

An atom's mass number equals the number of...

• protons plus the number of electrons
• protons plus the number of neutrons
• protons
• neutrons

Which statement about the atomic nucleus is correct?

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

Which statement best describes an electron?

• Smaller mass than a proton and a negative charge
• Smaller mass than a proton and a positive charge
• Greater mass than a proton and a negative charge
• Greater mass than a proton and a positive charge

Tags

NGSS.MS-PS2-3

Atomic number is equal to the number of electrons in an atom.

• true
• false

What is the atomic number for an element with three protons?

• 2
• 1
• 3
• 6

True or False? Isotopes are atoms of the same element that differ in mass number and number of neutrons

• True
• False

The number of protons in an atom identifies it as an atom of a paticular element.

• true
• false

Most atoms have either a positive or a negative charge.

• true
• false

Atoms of the same element with the same number of protons but different numbers of neutrons.

•  carbon
• electron
• isotoners
• isotope