Question

1. what is the atomic number of silicon?
2. a rubidium atom has ______ protons.
3. a sulfur atom has ______ protons.
4. the chemical symbol for gold is______.
5. an atom of uranium has ______ electrons.
6. the atomic weight for tin is ______.
7. the atomic weight for nickel is ______.
8. if oxygen has an atomic weight of 16, it has ______ neutrons.
9. if the atomic weight of krypton is 80, it has ______neutrons.
10. if francium has 136 neutrons, its atomic weight would be ______.
11. what family is neon in?
12. what element is in the halogen family and in the 2nd period of the periodic table?
13. name the alkali earth metal in the 4th period of the periodic table.

Explanation:

Step1: Recall silicon's atomic number

Atomic number = proton count (periodic table)

Step2: Recall Rubidium's proton count

Protons = atomic number (periodic table)

Step3: Recall Sulfur's proton count

Protons = atomic number (periodic table)

Step4: Recall Gold's chemical symbol

From standard element notation

Step5: Recall Uranium's electron count

Neutral atom: electrons = protons = atomic number

Step6: Recall Tin's atomic weight

From periodic table (average mass)

Step7: Recall Nickel's atomic weight

From periodic table (average mass)

Step8: Calculate oxygen's neutrons

Neutrons = atomic weight - atomic number; $16 - 8 = 8$

Step9: Calculate Krypton's neutrons

Neutrons = atomic weight - atomic number; $80 - 36 = 44$

Step10: Calculate Francium's atomic weight

Atomic weight = protons + neutrons; $87 + 136 = 223$

Step11: Recall Neon's periodic table family

Group classification of noble gases

Step12: Locate halogen in Period 2

Match group 17, period 2 element

Step13: Locate alkaline earth in Period 4

Match group 2, period 4 element

Answer:

1. 14
2. 37
3. 16
4. Au
5. 92
6. 118.71
7. 58.69
8. 8
9. 44
10. 223
11. Noble Gases (Group 18)
12. Fluorine (F)
13. Calcium (Ca)