Question 656:

• JAMB 1991

which of the following statements are TRUE of isotopes? i. isotopes of an element have the same chemical properties because they have the same number of electrons. ii. isotopes of elements are normally separated using physical properties. iii. isotopes of an element have the same number of protons in their nuclei.

A. I and ii only
B. I and iii only
C. Ii and iii only
D. I, ii, and iii

Question 657:

• JAMB 1991

When an atom loses or gains a charge, it becomes

A. An electron
B. An ion
C. A neutron
D. A proton

Question 658:

• JAMB 1991

4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?

A. 1\(\frac{1}{4}\) days
B. 8\(\frac{1}{4}\) days
C. 30 days
D. 80 days

Question 659:

• JAMB 1991

In a nuclear fusion process, four protons each of mass M_p were fused to produce a nucleus X of mass M_x. Which of the following equations is CORRECT?

A. 4M_p > M_x
B. 4M_p = M_x
C. 4M_p < M_x
D. M_p > M_x

Question 660:

• JAMB 1991

Which of the following are True for \(\alpha\)-decay. i. mass number, decrease by four. ii. Atomic number decreases by two. iii. mass number does not change.

A. I and ii only
B. Ii and iii only
C. I and iii only
D. I, ii, and iii only