Positioned at
group 16 and period 2
in the periodic table, oxygen is an unusually reactive non-metallic atom that forms compounds with nearly all other elements.
Why is oxygen in period 2?
Period 2 elements (carbon, nitrogen, oxygen, fluorine and neon)
obey the octet rule in
that they need eight electrons to complete their valence shell (lithium and beryllium obey duet rule, boron is electron deficient.), where at most eight electrons can be accommodated: two in the 2s orbital and six in the 2p subshell.
What period does oxygen belong to?
| Group 16 Melting point | Period 2 Boiling point | Block p Density (g cm − 3 ) | Atomic number 8 Relative atomic mass | State at 20°C Gas Key isotopes |
|---|
What is period 3 on the periodic table?
The third period contains eight elements:
sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon
. … All of the period 3 elements occur in nature and have at least one stable isotope.
What element is in group 17 period 3?
Chlorine
is a halogen in group 17 and period 3.
What is the color of oxygen?
We’re observers, however, so the real trick is how oxygen gets us to pretty colors. (Actually, though it’s a
colorless gas
, oxygen liquefies into an attractive blue fluid.) In its gaseous form, oxygen usually doesn’t glow.
Who named oxygen?
Among them was the colorless and highly reactive gas he called “dephlogisticated air,” to which the great
French chemist Antoine Lavoisier
would soon give the name “oxygen.”
How do we know oxygen exists?
An English chemist, Joseph Priestley, independently discovered oxygen in 1774 by
the thermal decomposition of mercuric oxide
and published his findings the same year, three years before Scheele published.
What are 3 uses for oxygen?
Common uses of oxygen include
production of steel, plastics and textiles, brazing, welding and cutting of steels and other metals
, rocket propellant, oxygen therapy, and life support systems in aircraft, submarines, spaceflight and diving.
How many elements does period 6 have?
The sixth period contains
32 elements
, tied for the most with period 7, beginning with caesium and ending with radon.
What is the period number?
The period number on the Periodic table
tells you the total number of orbits that the atom will have
. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 1st period indicates that these elements possess 1 energy shell (or energy orbit).
What is the name of the element in Group III period 4?
Scandium
.
Scandium (Sc)
is the third element in the period, and is the first transition metal in the periodic table. Scandium is quite common in nature, but difficult to isolate because it is most prevalent in rare earth compounds, which are difficult to isolate elements from.
Is Iodine a period 5 halogen?
Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). The Group 7A elements have seven valence electrons in their highest-energy orbitals (ns
2
np
5
). …
Which metal is in period 4 Group 8?
| 4A | (14) | 5A | (15) | 6A | (16) | 7A | (17) | 8A | (18) |
|---|
Why does the third period have 8 elements?
According to the 2n
2
rule, the maximum number of electrons in the third period = 2 x (3)
2
= 18. But, the
last shell cannot accommodate more than 8 electrons
so, the number of electrons in third period is 8. Hence, the number of elements is also 8.
