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 is a period number?
If you are given with the atomic number of an element you can find it’s period number and group number. The period number is related to the number of electron occupied shells in the element and the period number is linked to its valence electrons.
What do periods mean on the periodic table?
The horizontal rows of the periodic table are called periods. Each period corresponds to the successive occupation of the orbitals in a valence shell of the atom, with the long periods corresponding to the occupation of the orbitals of a d subshell.
What does the group number tell us?
The group number in the periodic table represents number of valence electrons of the elements in a certain group. For example, all the elements in Group−1 have 1 electron in their outer most shell.
What element is in Group 14 and Period 2?
SALIENT FEATURES OF GROUP 14 (CARBON FAMILY) ELEMENTS
| Period | Element | Atomic number (Z) |
|---|---|---|
| 2 | Carbon | 6 |
| 3 | Silicon | 14 |
| 4 | Germanium | 32 |
| 5 | Tin | 50 |
What is helium period Number?
2. Group. group 18 (noble gases) Period. period 1.
Where is helium used today?
Helium is used as a cooling medium for the Large Hadron Collider (LHC), and the superconducting magnets in MRI scanners and NMR spectrometers. It is also used to keep satellite instruments cool and was used to cool the liquid oxygen and hydrogen that powered the Apollo space vehicles.
How can I invest in helium?
If you wanted to invest in helium, the simplest path would be to buy up stock in a helium producer or storage company. A good derivative play would be to invest in clowns.
What is a safe level of oxygen?
Normal arterial oxygen is approximately 75 to 100 millimeters of mercury (mm Hg). Values under 60 mm Hg usually indicate the need for supplemental oxygen. Normal pulse oximeter readings usually range from 95 to 100 percent. Values under 90 percent are considered low.
At what oxygen level do you pass out?
People should contact a health care provider if their oxygen saturation readings drop below 92%, as it may be a sign of hypoxia, a condition in which not enough oxygen reaches the body’s tissues. If blood oxygen saturation levels fall to 88% or lower, seek immediate medical attention, says Dr.