2 3 4 5 6 Element
Oceans
Chemic Solid,
al
liquid, or
Symbol gas
Atomic
Number
Earth's
Crust
Atmosphere
Living
Matter
1.Hydrogen
H
Gas
1
X
2.Oxygen
3. Carbon
4. Calcium
5. Magnesium
6.
Potassium
7. Sodium
8.Chlorine
9. nitrogen
10.Sulfur
11. Aluminum
to add speaker notes

Which is a difference between molecular compounds and ionic compounds? select the correct answer below: question 5 options: molecular compounds typically form between a metal and a nonmetal, while ionic compounds typically form between nonmetals. molecular compounds result from the transfer of electrons between atoms to form ions, while ionic compounds result from the sharing of electrons between neutral atoms. molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges. molecular compounds have high melting points and high boiling points, while ionic

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.