In a nonpolar covalent bond, protons are shared equally by two atoms. electrons are shared equally by two atoms. electrons are shared unequally by two atoms. protons are transferred from one atom to another. which molecule below has a triple covalent bond? diatomic fluorine diatomic nitrogen diatomic oxygen diatomic hydrogen

#11: In a nonpolar covalent bond, electrons are shared equally between two atoms.

#12: Only the diatomic nitrogen molecule contains a triple covalent bond among the four molecules.

Explanation:

Consider: what is a covalent bond?

Two atoms share a pair of electrons (called a bonding pair as opposed to a lone pair) between them.

Nonpolar covalent bonds exist only between atoms with similar electronegativity values. The two bonding atoms attract the bonding pair with similar strength, such that the bonding pair is shared mostly equally between the two atoms.

In case the two atoms differ in their electronegativity, the bonding pair will be closer to the more electronegative atom. That will make a polar covalent bond.

Atoms share electrons with each other to achieve an octet of eight valence electrons (two for hydrogen.) Atoms form a covalent bond for every two valence electrons that they need.

Consider: how many electrons do atoms in each molecule need to gain before achieving an octet?

Fluorine is in group 17 of the new IUPAC periodic table. Each fluorine atom needs 18 - 17 = 1 valence electron to achieve an octet. There are two fluorine atoms in an molecule. These two atoms will need two electrons in total to achieve an octet. They will thus need to form covalent bond.

Similarly:

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

10 years is the answer