Which of the following equipment is not used to detect radioactivity?
- A. Wilson cloud chamber
- B. Geiger- muller counter
- C. Mass spectrometer
- D. Photographic plate
A metal X forms two chlorides with the formulae XCI2 and XCI3. Where is X in the Periodic Table?
What type of bonding exists between X and chlorine in each of the chlorides?
- A. metallic bonding
- B. ionic bonding
- C. covalent bonding
- D. dative bonding
A metal X forms two chlorides with the formulae XCI2 and XCI3. Where is X in the Periodic Table?
- A. Group ll
- B. Group llI
- C. d-block
- D. s-block
One of the characteristics of transition metals is
- A. reducing ability
- B. ductility
- C. ability to conduct electricity
- D. formation of coloured ions
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
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
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
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
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