Which list of elements shows increasing atomic size, from
smallest to largest.
o be, mg, ca, sr
o
k, ca, cr, co
o xe, kr, ai, ne
ai, si, p, s

The answer is one of two options

K, Ca, Cr, Co

or

Ai, Si, P, S

Explanation:

For one look at a periodic table

But how you get the answer is by looking at the atomic number that is how many protons and electrons are in the atom ex: Oxygen or O has a atomic number of 8 because it has EXACTLY 8 protons and EXACTLY 8 electrons.

Now the reason I put two answers is because if it has to be a perfect line with no elements in between it is the second choice

But if it doesn't it can be either or.

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.