Author Question: The elements in the periodic table which lack one electron from a filled shell are referred to as ... (Read 28 times)

KWilfred · **on:** Jul 29, 2018

The elements in the periodic table which lack one electron from a filled shell are referred to as

A)

noble gases.
B)

halogens.
C)

alkali metals.
D)

transition elements.
E)

none of the above.

Question 2

A star has absolute luminosity equal to that of the Sun (1.5 108 km from the Earth) but is 10 pc away from the Earth. By what factor will it appear dimmer than the Sun?

A)

2 10-9
B)

2 10-11
C)

2 10-13
D)

2 10-15
E)

2 10-17