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.
Why is oxygen in period 2 of the periodic table?
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 row period is oxygen in?
| 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 do period 2 elements have in common?
All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons .
What element is in Group 2 period 2?
Berilium is located in period 2 group2. Answer: group 2A—the alkaline earth metals. group 2A or(ll A)of the periodic table are the alkaline earth metals :beryllium, magnesium, calcium, strontium,barium and radium.
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.”
What is the color of oxygen?
The gas is colorless , odorless, and tasteless. The liquid and solid forms are a pale blue color and are strongly paramagnetic.
Which period can you find helium?
Helium is the second element on the periodic table. It is located in period 1 and group 18 or 8A on the righthand side of the table. This group contains the noble gases, which are the most chemically inert elements on the periodic table.
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).
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 is the trend in melting point for period 2?
The melting points and boiling points tend to peak in the middle of Periods 2 and 3 (Groups 3/13 and 4/14) and the lowest values at the end of the period – the Noble Gases.
Which is an F block element?
The f block elements are the lanthanides and actinides and are called the inner transition elements because of their placement in the periodic table due to their electron configurations. The f orbitals of the electron shell are filled with “n-2.” There is a maximum of fourteen electrons that can occupy the f orbitals.
Is a period having elements from atomic number 11 to 18?
The periods are of varying lengths. First there is the hydrogen period, consisting of the two elements hydrogen, 1, and helium, 2. Then there are two periods of eight elements each: the first short period, from lithium, 3, to neon, 10; and the second short period, from sodium, 11, to argon , 18.
What number increases from 3/10 to period 2?
In the periodic table, atomic number increases from 3 to 10 in period 2. Explanation: Atomic numnber is the total number of protons present in an atom.
Which element is in Group 2 Period 7?
| Group 1 2 | Atomic # Name 87 Fr 88 Ra |
|---|
Which element deviates from the trend in period 2?
In the whole of period 2, the outer electrons are in 2-level orbitals – 2s or 2p. These are all the same sort of distances from the nucleus, and are screened by the same 1s 2 electrons. The major difference is the increasing number of protons in the nucleus as you go from lithium to neon .
