Question

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

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

question 23 (1 point)
to what category of elements does an element belong if it is a poor conductor of electricity? —
o a transition elements
o b metals
o c metalloids
o d nonmetals

Explanation:

• Question 21: In the periodic table, each period corresponds to a principal energy level. Electrons fill these principal energy levels as we move across a period.
• Question 22: The modern periodic table is arranged in order of increasing atomic number. Atomic number is defined as the number of protons in an atom's nucleus, and this is the basis for the organization of elements in the modern table.
• Question 23: Non - metals are generally poor conductors of electricity. Metals are good conductors, metalloids have intermediate conductivity properties, and transition elements (which are metals) are also good conductors.

Answer:

• Question 21: a. principal energy level
• Question 22: a. number
• Question 23: d. nonmetals