1 Which of the following number of subatomic particles of carbon atom is correct?

• 6 protons and 6 neutrons

• 12 protons and 6 neutrons

• 6 protons and 12 neutrons

• 12 protons and 12 neutrons

Which of the following information are obtained directly from a mass spectrum?

I Number of isotopes present

II Molar mass of the isotopes

III Molecular formula of a compound

IV Percentage abundances of isotopes

• I and II

• II and III

• III and IV

• I and V

In an experiment, a compound was found to contain 15% of hydrogen and 85% of carbon by mass. What is the empirical formula of this compound?

• CH₂

• CH₄

• C₂H₄

• C₄H₁₀

What is the mass of 3.35 moles of sulfur trioxide

• 335 g

• 268 g

• 245 g

• 125 g

A subatomic particle that has a negative charge is called a(n)

• proton

• neutron

• electron

• nucleus

An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have?

• 30

• 26

• 56

• 82

Which one is atom?

• Na(s)

• NaCl(s)

• H₂O(l)

• Br₂(l)

An atom made up above particles, EXCEPT:

• Proton

• Neutron

• Electron

• Nucleon

Determine the number of neutron for element Cu

• 63

• 29

• 34

• 92

______________is total number of protons and neutrons in the nucleus of an atom of an element

• Nucleon

• Isotopes

• Nucleus

• Atom