chap 4 - periodic table of elements Flashcards
1
Q
what are groups in the periodic table of elements
A
groups are vertical columns in the periodic table of elements
2
Q
what are periods in the periodic table of elements
A
periods are horizontal rows in the periodic table of elements
3
Q
what are the elements in group 18
A
helium, neon, argon, krypton, xenon, radon & oganesson
4
Q
what are the elements in group 18 called
A
inert gases
5
Q
why are inert gases chemically unreactive
A
because inert gases have already achieved stable duplet or octet electron arrangement
6
Q
what is the physical changes when going across period 3
A
solid to gas
