Modern Periodic Table Flashcards
1
Q
why do we have those rows on the bottom
A
- so it doesn’t take up as much space
2
Q
known elements
A
- 118 elements are currently known
- 96 are metals
- 35 are radioactive
- 25 are man made (all radioactive)
- 11 occur as gases
- 2 occur as liquids
3
Q
a group or famil
A
- assigned Roman numerals with an A or B
4
Q
row or period
A
- assigned numbers
5
Q
classification by electronic configuration
A
- one useful way of characterizing elements is by looking for the last electron added to an element - distinguishing electron
- representative - s or p as last electron
- noble gas - all s and p are filled
- transition - last electron was a d
- inner transition - last electron was an f
