Question

multiple select question select all that apply the second row of the periodic table ends with the noble gas neon. has elements with two occupied energy levels. includes the elements sodium, magnesium, and argon, among others. includes eight elements.

Explanation:

1. The second - row elements of the periodic table range from lithium (Li) to neon (Ne). Neon is a noble gas and is the last element of the second row, so the first option is correct.
2. Second - row elements have electrons in two occupied energy levels (the first and second energy levels), so the second option is correct.
3. Sodium (Na), magnesium (Mg), and argon (Ar) are not in the second row. Sodium and magnesium are in the third row, and argon is also in the third row, so the third option is incorrect.
4. The second row of the periodic table has 8 elements (lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon), so the fourth option is correct.

Answer:

A. ends with the noble gas neon.
B. has elements with two occupied energy levels.
D. includes eight elements.