Question

question 5
0.2 pts
which element has the maximum number of dots in its electron dot symbol?
o mg
o cu
o ar
o ba
question 6
0.2 pts
release of light from an atom occurs when an electron____
o jumps from a lower to a higher energy level
o moves with in its atomic orbital
o falls into the nucleus
o drops from a higher to a lower energy level
question 7
0.4 pts
the element found in the 4th row which has 3 single electrons in the 4p orbitals is
o as
o sc
o al
o v

Explanation:

• Question 5: Electron - dot symbols represent valence electrons. Mg has 2 valence electrons, Cu has 1 (in the outer - most shell for the dot - symbol), Ar has 8 valence electrons, and Ba has 2 valence electrons. So Ar has the most dots in its electron - dot symbol.
• Question 6: When an electron drops from a higher to a lower energy level, the excess energy is released as light. An electron moving within an orbital or jumping to a higher energy level does not release light, and electrons do not fall into the nucleus under normal circumstances.
• Question 7: In the 4th row, As (arsenic) has the electron configuration [Ar] 4s²3d¹⁰4p³, with 3 single electrons in the 4p orbitals. Sc has a different electron configuration with electrons in the 3d and 4s orbitals mainly, Al is in the 3rd row, and V has electrons in 3d and 4s orbitals with a different electron - configuration pattern.

Answer:

• Question 5: C. Ar
• Question 6: D. drops from a higher to a lower energy level
• Question 7: A. As