Elements and the Periodic Table
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Please answer the following questions in complete, quality, and correct sentences on a separate sheet of paper.

1. a. Why can't we see electrons?

b. Why is it very hard to clearly see protons and neutrons?

 

2. Tell the Atomic Name for the following elements.

a. O	b. Au	c. Ra
d. Mn	e. Ga	f. Na

3. Tell the Atomic Number for the following elements.

a. Oxygen (O)	b. Antimony (Sb)	c. Phosphorus (P)
d. Titanium (Ti)	e. Palladium (Pd)	f. Lawrencium (Lr)

4. How many protons do the following elements have?

a. Sulfur (S)	b. Silver (Ag)	c. Calcium (Ca)
d. Krypton (Kr)	e. Platinum (Pt)	f. Uranium (U)

5. Tell the Atomic Mass (of one mole) in GRAMS for the following elements.

a. Boron (B)	b. Iridium (Ir)	c. Potassium (K)
d. Radium (Ra)	e. Gold (Au)	f. Silicon (Si)

6. What is the Atomic symbol for the following elements?

a. Vanadium	b. Osmium	c. Plutonium
d. Radon	e. Silver	f. Mercury

7. How many neutrons do the following elements have?

a. Boron (B)	b. Iridium (Ir)	c. Potassium (K)
d. Radium (Ra)	e. Gold (Au)	f. Silicon (Si)

8. Identify the atom shown, then draw and label its parts, including charges. (Note the 3 blue colored particles in the center have positive charges.)

9. Flash! You are suddenly shrunk to subatomic particle size and find yourself in the center of a Carbon atom! Hokey Smoke!

Tell which part of statements below would be possible or not. Explain why this is so.

"You look out and see a neutral Carbon atom with 6 protons and 6 neutrons. Then you turn around and are amazed to see all 6 electrons orbiting the atom."

10. Ions. Tell which of the following atoms are ions. Tell what each ion's charge is.

a. A Lithium atom with 2 electrons

b. A Fluorine atom with 10 electrons

c. A Magnesium atom with 12 electrons

11. a. Tell how many molecules of each compound (below) are shown.

b. Tell how many atoms of each element are in each of the molecules below.

a. HCl	b. 2Al2O3	c. 2CO2
d. Na3PO4	e. 6NaCl	f. CaCO3

 

How to calculate the number of elements in a molecule & the number of molecules present.

1. The number of molecules is indicated by the number in front of the molecular compound.

For Example the below symbols indicate:

6H2SO4 = 6 molecules of Sulfuric Acid

4C6H12O6 = 4 molecules of sugar

 

2. The number of atoms in a molecule is affected by two things.

A: The amount of atomic symbols present in the compound

For Example:

NaCl (Sodium Chloride) has 2 atoms, 1 of Sodium (Na) and 1 of Chlorine (Cl).

Also

CO (Carbon monoxide) has 2 atoms, 1 of Carbon (C) and 1 of Oxygen (O)

 

B: By the subset number behind an atomic symbol or set of symbols in a compound

For Example:

H2O (Water) contains 3 atoms. Two of Hydrogen, One of Oxygen

H2SO4 (Sulfuric Acid) contains 7 atoms, 2 of Hydrogen, 1 of Sulfur, and 4 of Oxygen

Also

Mg(OH)2 (Magnesium Hydroxide) contains 5 atoms, 1 of Magnesium, 2 of Oxygen, and 2 of Hydrogen

 

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