Which statement about atomic structure is incorrect?
a) protons are located in the nucleus.
b) protons and electrons have the same mass.
c) protons and electrons have opposite charges.
d) neutral atoms contain the same number of protons and electrons.

The correct answer is B proton and electron have same mass .

Explanation:

The mass of a proton is 1.67×10∧-27 kg whereas the mass of an electron is 9.1×10∧-31 kg.

    From this point of view it can be stated that a proton is more heavier than an electron.

idk i’m struggling too

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.