Consider the single atoms of the elements listed. which single atom would require the largest amount of energy to remove its outermost electron? a) ar b) cl c) mg d) na

A) Ar

Explanation: Argon [Ar]  has an atomic no of 18 and the electronic configuration is:

Ar :

Chlorine [Cl] has atomic no of 17 and thus the electronic configuration is :

Cl :

Magnesium [Mg] has atomic no of 12 and thus the electronic configuration is :

Mg :

Sodium has atomic no of 11 and thus the electronic configuration is :

Cl :

As we move across a period the number of electrons are being added to the same shell but the number of protons increases, thus the electrons are being tightly held and thus the atomic radius keeps on decreasing.

Thus the smallest atom would have a tightly bound electron nearer to the nucleus. As argon is the last element of the period, it is the smallest in the period and thus largest amount of energy will be required to remove the outermost electron.

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.

i believe it is a.) released into

explanation: