Elements And Isotopes (Page 2 of 4) in pdf

Elements And Isotopes Page 2

Elements and Isotopes

THINK VISUALLY

The diagrams show models of carbon isotopes. Complete the

diagrams by drawing in the rest of the atomic particles, remember that the number at the end

represents that isotopes specific mass.

Nonradioactive

Radioactive

carbon-13

carbon-14

Use your completed diagrams to answer Questions 3–4.

3. Identify two differences between carbon-12 and carbon-14.

Mass is different (12 amu vs. 14 amu)

Neutron count is different (7 vs. 8)

4. Identify two ways in which carbon-12, carbon-13, and carbon-14 are alike.

All have the same proton count (6 protons)

All have the same electron count (6 protons)

For Questions 5–7, complete each statement by writing the correct word or words.

Choice of words: ions, isotopes, atoms, electrons

5. A chemical element is a pure substance that consists entirely of one type of atoms.

6. Atoms of the same element that differ in the number of neutrons they contain are called

isotopes.

7. An atom is made up of protons, neutrons, and electrons.

Chemical Bonds

10. Sea salt contains calcium chloride (CaCl

), an ionic compound similar to table salt. One atom

of calcium (atomic number 20) bonds to two atoms of chlorine (atomic number 17). Fill in the

number of protons and electrons in each ion.

Chloride ion

Calcium ion

Chloride ion

Protons 17

Protons 20

Protons 17

Electrons 18

Elements And Isotopes Page 2