periodic table elements 1-20 Flashcards
H
atomic #-1
element: Hydrogen
Electric configuration-(1)
not a metal- gas
He
atomic #- 2
element- helium
Electric config- (2)
not a metal- Nobel gas
Li
atomic #- 3
element- Lithium
Electric config.- (2,1)
metal
Be
atomic #- 4
element- Beryllium
Electric config.- (2,2)
metal
B
atomic #- 5
element- Boron
Electric config.- (2,3)
metal
C
atomic #- 6
element- Carbon
Electric config.- (2,4)
N
atomic #- 7
element- Nitrogen
Electric config.- (2,5)
O
atomic #- 8
element- Oxygen
Electric config.- (2,6)
F
atomic #- 9
element- Fluorine
Electric config.- (2,7)
Ne
atomic #- 10
element- Neon
Electric config.- (2,8)
Nobel gas
Na
atomic #- 11
element- Sodium
Electric config.- (2,8,1)
metal
Mg
atomic #- 12
element- Magnesium
Electric config.- (2,8,2)
metal
Al
atomic #- 13
element- Aluminum
Electric config.- (2,8,3)
metal
Si
atomic #-14
element- Silicon
Electric config.- (2,8,4)
P
atomic #- 15
element- Phosphorous
Electric config.- (2,8,5)
S
atomic #- 16
element- Sulphur
Electric config.- (2,8,6)
Cl
atomic #-17
element- Chlorine
Electric config.- (2,8,7)
Ar
atomic #- 18
element- Argon
Electric config.- (2,8,8)
Nobel gas
K
atomic #- 19
element- Potassium
Electric config.- (2,8,8,1)
metal
Ca
atomic #- 20
element- Calcium
Electric config.- (2,8,8,2)
metal
What makes He, Ne and Ar different from the rest of elements
They all have completely filled valence shells. Thus they are stable, unreactive and called Noble gases
What is a metal?
An element that has 1,2,3 valence electrons except hydrogen and helium
What is a non-metal?
A non-metal has 4+ valence electrons
What are metalloids?
Some elements are referred to as semi metals or metalloids which show the properties in-between metals and non-metals
Some metalloids are- Boron and Silicon
