Question

question 20 (1 point)
which of the following elements is in the same period as phosphorus?
o a carbon
b magnesium
o c nitrogen
o d oxygen

question 21 (1 point)
each period in the periodic table corresponds to a(n) _.
o a energy sublevel
b orbital
o c principal energy level
d suborbital

question 22 (1 point)
the modern periodic table is arranged in order of increasing atomic _.
o a mass
b number
o c charge
d radius

Explanation:

Question 20

• Phosphorus (\(P\)) is in period 3 of the periodic table.
• Magnesium (\(Mg\)) is also in period 3.
• Carbon (\(C\)) is in period 2.
• Nitrogen (\(N\)) is in period 2.
• Oxygen (\(O\)) is in period 2.

• Each period in the periodic table corresponds to a principal energy level.
• Energy sublevels (\(s\), \(p\), \(d\), \(f\)) are within principal energy levels.
• Orbitals are regions within sublevels.
• Suborbital is not a standard term for this context.

• The modern periodic table is arranged in order of increasing atomic number.
• Atomic mass was used in early tables but has some inconsistencies.
• Charge is related to ions and not the basis of the modern table's arrangement.
• Atomic radius varies within periods and groups and is not the organizing principle.

Answer:

b. magnesium

Question 21