Atoms and Isotopes

What does the atomic number represent?

• the number of protons

• the number of protons and neutrons

• the number of neutrons

• the number of protons and electrons

What is the atomic number of this atom?

• 4
• 5
• 9
• none of the above

Tags

NGSS.MS-PS1-1

Chlorine has two naturally occurring isotopes, Cl-35 and Cl-37. If both their atomic numbers are 17, how many neutrons does Cl-37 have?

• 35

• 20

• 17

• 34

Subatomic particles with a negative charge

• Electrons

• Neutrons

• Protons

• Quarks

The atomic mass of an isotope is equal to the number of ______ in an atom.

• Protons
• Neutrons
• Protons + Neutrons
•  Electrons

For an atom, the number of electrons is equal to the number of _____

• protons
• protons plus neutrons
• neutrons
• nucleons

An atom of fluorine (F) has an atomic mass of 19. If the atomic number is 9, what can you assume about this atom?

• it has 9 neutrons

• it has 10 electrons

• it has 10 neutrons

• it has 10 protons

4. What electrical charge do electrons carry?

• positive charged

• no electricity charged

• negative charged

What do these isotopes of carbon all have in common?

• neutrons & mass number
• atomic number and neutrons
• atomic number and electrons
• protons, atomic number, and mass number

Which of the following does NOT differ in isotopes of the same element?

• mass number

• number of neutrons

• number of protons

• chemical properties