Ch. 3 Flashcards
1
Q
Which element is in the s block? One that you might not expect.
A
He
2
Q
Where do we find the number of valence electrons for group- A elements of the periodic table?
A
The column number
3
Q
Atomic number vs. atomic weight or mass
A
Atomic number is above the element and shows number of protons the atom has.
Atomic mass/weight is the the average weight (in atomic mass units) of all the isotopes of the particular element.
4
Q
Isotopes def?
A
Isotopes are a group of the same kinds of elements that have different mass numbers (but the same number of protons) as a result of fewer or more neutrons residing in the nucleus.
5
Q
How to find out how many valence shell electrons are in an element?
A
Find which group number it’s in
