Atoms And Isotopes

Question 1

Amu

Answer 1

Atomic mass unit. Unit of measure used for atoms.

Question 2

Neutrons

Answer 2

Neutral-no electric charge. All neutrons are identical. Mass-1 amu

Question 3

Nucleus

Answer 3

Has the most mass of the atom but the least volume.

Question 4

Electrons

Answer 4

Negatively charged particles. Found within the cloud. Mass-0 amu.

Question 5

Number of Protons and Electrons in an atom

Answer 5

Atoms are neutral. # of protons = # of electrons

Question 6

Ions

Answer 6

Atoms with missing or extra electrons

Question 7

Hydrogen Atom

Answer 7

The simplest atom. Has one proton and one electron.

Question 8

Typical Atom

Answer 8

1. # of protons = # of electrons
2. Has varying # of neutrons to hold the nucleus together
3. # of protons tells you what element it is

Question 9

Atomic number

Answer 9

How many neutrons in an atom. This never changes.

Question 10

Isotopes

Answer 10

1. Atoms with same # of protons but different # of neutrons
2. Radioactive isotopes have unstable nuclei that spontaneously fall apart
3. All isotopes of element share most of the same properties
4. Can be identified by its mass number.

Question 11

Naming Isotopes

Answer 11

And isotope is named with its element and mass number.

Question 12

How to find # of neutrons

Answer 12

The number of neutrons can be figured out if you know it’s name.

Mass# - Atomic# = #Neutrons

Ex: Carbon has an atomic number of 6
C-12/ 12-6 = 6 neutrons

Question 13

Atomic Mass (Weight)

Answer 13

The weighted average of the masses of all the isotopes of that element.

Question 14

Protons

Answer 14

Positively charged particles. All protons are identical. Mass-1 amu