Question

compare the number of protons, neutrons, electrons, and nucleons for the two isotopes: li - 6 li - 7 number of protons 1 2 number of neutrons 3 4 number of electrons 5 6 number of nucleons 7 8 chemical reactions only involve the outermost electrons. the two isotopes of lithium are expected to have the same chemical properties because they have the same number of 9 and protons. it is only 10 that are involved in chemical reactions. thus, 11 do not affect chemical reactivity. the number of protons affects chemical properties because the number of protons determines the number of 12 in an element. a. 3 b. 4 c. 5 d. 6 e. 7 f. electrons g. protons h. nucleons i. neutrons

Explanation:

Step1: Recall atomic number of lithium

Lithium (Li) has an atomic number of 3. The number of protons is equal to the atomic number. So for both Li - 6 and Li - 7, the number of protons is 3.

1. A
2. A

Step2: Calculate number of neutrons

The mass - number is the sum of protons and neutrons. For Li - 6, mass - number = 6, and number of protons = 3, so number of neutrons = 6 - 3=3. For Li - 7, mass - number = 7, and number of protons = 3, so number of neutrons = 7 - 3 = 4.

1. A
2. B

Step3: Determine number of electrons

In a neutral atom, the number of electrons is equal to the number of protons. Since both Li - 6 and Li - 7 are neutral, the number of electrons is 3 for both.

1. A
2. A

Step4: Calculate number of nucleons

Nucleons are protons and neutrons. For Li - 6, number of nucleons = 6. For Li - 7, number of nucleons = 7.

1. E
2. E

Step5: Understand chemical - property determinants

Chemical reactions involve outer - most electrons. Isotopes have the same number of electrons and protons, so they have the same chemical properties. Neutrons do not affect chemical reactivity as they are in the nucleus and not involved in chemical reactions. The number of protons determines the number of electrons in a neutral atom.

1. F
2. F
3. I
4. F

Answer:

1. A. 3
2. A. 3
3. A. 3
4. B. 4
5. A. 3
6. A. 3
7. E. 6
8. E. 7
9. F. electrons
10. F. electrons
11. I. neutrons
12. F. electrons