Chemistry

The spectral region is split into ___________

How many neutrons are there in a helium atom?

The detector converts IR radiation into __________ signals and sends it to the recorder.

how many groups are present in periodic table?

• 17

• 16

• 15

• 18

The symbol of Gold is...............

• Go

• Gu

• Au

• Ag

The vertical Column present in periodic table is called..........

• column

• group

• periods

• bars

The function of pressure regulators in the emission system of flame photometer is to have a steady flame which is free from flickers?

• True

• False

................ number of periods are present in periodic table.

• 5

• 6

• 7

• 8

The number at the top of each square on the periodic table tells us the...

• number of protons in the atom.
• The number of electrons in the atom. 
• The number of nuetrons in the atom.
• The number of protons and electrons in the atom.

In fluorescence, absorption of energy by atoms or molecules followed by .............. emission of light.

• Moderate

• Delayed

• Immediate

• None of the above