13 what letters represent the sub - levels?\n a,b,c,d,f,g\n s,p,d,f,g\n s,d,p,f,q\n12 what is the principle…

13 what letters represent the sub - levels?\n a,b,c,d,f,g\n s,p,d,f,g\n s,d,p,f,q\n12 what is the principle quantum number?\n the energy level or period\n the sub - levels\n and unknown number\n9 what element does not have 7 valence electrons?\n mn\n f\n zn

13 what letters represent the sub - levels?\n a,b,c,d,f,g\n s,p,d,f,g\n s,d,p,f,q\n12 what is the principle quantum number?\n the energy level or period\n the sub - levels\n and unknown number\n9 what element does not have 7 valence electrons?\n mn\n f\n zn

Answer

Question 9

Brief Explanations:

Valence electrons are outer - shell electrons. Fluorine (F) in group 17 has 7 valence electrons. Manganese (Mn) has 7 outer - shell electrons in its electron configuration. Zinc (Zn) in group 12 has 2 valence electrons.

Answer:

C. Zn

Question 12

Brief Explanations:

The principal quantum number (n) represents the energy level or shell of an electron in an atom and is related to the period in the periodic table. Sub - levels are represented by the angular momentum quantum number (l).

Answer:

A. The energy level or period

Question 13

Brief Explanations:

The sub - levels in an atom are represented by the letters s, p, d, f, g.

Answer:

B. s, p, d, f, g