Author Question: How many significant digits are present in the number 0.02560? A) 3 B) 4 C) 5 D) ... (Read 59 times)

jparksx · **on:** Aug 27, 2018

How many significant digits are present in the number 0.02560?

A) 3
B) 4
C) 5
D) 6

Question 2

It is relatively easy to pull an electron away from a potassium atom (K, atomic number 19), but very difficult to remove a second one because ________.

A) of the repulsions occurring between electrons within the same shell
B) the electrons are so very small
C) of a much greater effective nuclear charge
D) very little energy remains after the first electron is removed