FINALPTES8galv

Which is discovered by J.J. Thomson as negatively charge particles embedded in a positively charge matter and developed the plum pudding model of the atom?

• electron

• neutron

• nucleus

• proton

Rutherford’s gold foil experiment showed that most alpha particles passed through the foil, while a few were deflected. What conclusion did this lead to?

• Atoms are mostly solid.

• Electrons are in fixed shells.

• Atoms are mostly empty space with a dense nucleus.

• Atoms are indivisible and can’t be separated by any means.

Which subatomic particle is located inside the nucleus having a positive charge determining the identity of an atom?

• electron

• neutron

• nucleon

• proton

        I. Proton has almost the same mass with neutron.

                  II. The mass of an atom is concentrated at the nucleus.

                  III. Electrons and protons are located within the nucleus.

                  IV. The charge of electron is opposite to the charge of proton.

Which of the following statements are TRUE about the subatomic particles?

• I, II, and III

• I, II, and IV

• I, III, and IV

• I, II, III, and IV

Which is equal to the number of protons when an atom is electrically neutral?

• # of electrons

• # of neutrons

• # of nucleons

• # of nucleus

One isotope of oxygen has the atomic number 8 and the mass number 18. Which is CORRECT about the atom of this isotope?

• has 8 protons

• has 8 neutrons

• has 9 neutrons

• has 18 electrons

Which of the following indicates a loss of electron in an ion?

• Ca

• Mg 2⁺

• NO^3-

• O^2-

How many electrons are there in a chloride ion (Cl^–1) if chlorine has an atomic number of 17?

• 16

• 17

• 18

• 19

Which isotope which has 26 p⁺, 30 n⁰ & 24 e^– ?

• Cr-24

• Fe-56

• He-4

• Zn-30

       I. Neutral atom has unequal number of protons, neutrons and electrons.

                II. Atoms are the smallest particles that retain the characteristics of an element.

                III. Isotopes are atoms of the same element with unequal number of neutrons in the nucleus.

                IV. Ions are atoms with unequal number of protons and electrons and are formed when an atom loses or gains electrons.

Which of the following statements CORRECTLY describes atoms, ions and isotopes?

• I, II, and III

• I, II, and IV

• II, III, and IV

• I, III, and IV