WAEC Chemistry Past Questions & Answers - Page 186

926.

A nuclide emits a beta-particle (e) in the process, that atomic number

A.

increases by 1 while the mass numer remains constant

B.

decreases by 2 while the mass number remains constant

C.

remains constant while the mass number decreases by 2

D.

remains constant while the mass number increases by 1

Correct answer is A

No explanation has been provided for this answer.

927.

Which of the electrons in the following orbitals will experience the greatest nuclear attraction?

A.

1s electron of helium

B.

1s electron of potassium

C.

23 electron of boron

D.

2s electron of carbon

Correct answer is A

No explanation has been provided for this answer.

928.

Which of the following properties of elements deceases generally across a period in the Periodic Table?

A.

Electronegativy

B.

Electron affinity

C.

Atomic radluc

D.

lonlzation energy

Correct answer is C

No explanation has been provided for this answer.

929.

Which of the following electron transition results in the emission of energy?

A.

3p to 3s

B.

3p to 4p

C.

2s to 2p

D.

1s to 2s

Correct answer is A

No explanation has been provided for this answer.

930.

The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?

A.

13 electrons and 14 protons

B.

13 neutrons and 14 protons

C.

13 protons and 14 neutrons

D.

13 electrons and 14 neutrons

Correct answer is C

No explanation has been provided for this answer.