Isotopes

What is the correct definition for isotopes?

• atoms with the same number of protons and neutrons

• Atoms with the same number of protons but different number of neutrons

• Atoms with the same number of neutrons but different number of protons

• Atoms with no mass

• The atomic number indicates the number of neutrons

• The atomic number indicates the isotope number

• The atomic number indicates the number of protons

• The atomic number indicates the number of protons and neutrons

If you want to determine the total number of protons and neutrons in an atom, you can refer to the

• atomic mass

• atomic number

• symbol

• charge

What is the difference between these 3 Lithium isotopes?

• no difference

• they have the same atomic number

• they have the same mass number and atomic number

• they have different mass numbers

What is the atomic number of Neon, Ne?

• 10
• 20.1798
• 10.1798
• 7

A neutral atom of the isotope ²⁶₁₂Mg would consist of

• 12 protons, 26 neutrons, 26 electrons
• 26 protons, 12 neutrons, 26 electrons
• 26 protons, 14 neutrons, 14 electrons
• 12 protons, 14 neutrons, 12 electrons

An atom is electrically neutral when

• protons and neutrons are the same
• protons and electrons are the same
• neutrons and electrons are the same
• neutrons balance the protons and electrons

Isotopes of the same element have the same number of 

• protons
• neutrons
• electrons
• not enough information

A carbon isotope consists of 6 protons, 6 electrons and 8 neutrons.  What is the mass number for this isotope?

• 12
• 14
• 6
• 8

Protons and neutrons are found in the center of the atom called the:

• nucleus

• neutron

• shell

• cell