Question

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

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

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

Explanation:

• Question 21: In the periodic table, each period (row) corresponds to a principal energy level. As we move down a period, electrons are added to higher - energy orbitals within the same principal energy level.
• 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. This arrangement helps in predicting the chemical and physical properties of elements based on their electron configurations.
• Question 23: Non - metals are generally poor conductors of electricity. Metals are good conductors, metalloids have intermediate conductivity (semiconductors in some cases), and transition elements (which are metals) are also good conductors due to the delocalization of electrons in their metallic bonding.

Answer:

• Question 21: B. principal energy level
• Question 22: D. number
• Question 23: D. nonmetals