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How many of the recently discovered elements follow periodic law?
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
What is necessary for substances to burn?
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
Mendeleev arranged the elements according to
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
Each column on the periodic table is called
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
How do the physical and chemical properties of the elements change?
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
Elements to the left of the zigzag line are
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
What element makes up about 20% of the air we breathe?
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
The horizontal rows in the periodic table are called
oxygen
Oxygen
atomic mass
group
all of them
metals
across each period
periods
Check it!