1 How many valance electrons are in the atom of potassium (K) below?
K

A. 2
B. 8
C. 1
D. 4

If the element whose electric configuration ends in the d sublevel, the element is calssified as? a.inner transition b.noble gases c.representative d. transition

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

What are the first three quantum numbers for the electrons located in subshell 2s?