The Works Of Dalton, Millikan, Rutherford, Moseley, Thompson, Bohr Jamb Chemistry Past Questions

Question 6

How many electrons will be found in the nucleus of an atom with mass number 23 and 17 neutrons?

jamb 2019

• A. none
• B. 6
• C. 7
• D. 8

Question 7

Which of the following is the electronic configuration of sodium?

(Atomic number of Na = 11)

jamb 1981

• A. 1s² 2s²2p⁶ 3s²
• B. 1s² 2s²2p⁶ 3s² 3p1s² 2s²2p⁶ 3s¹
• C. 1s² 2s²2p⁶ 3s¹
• D. 1s² 2s²2p⁶ 3s^°
• E. 1s² 2s²2p⁶ 4s¹

Question 8

Allotropes are elements having?

jamb 1981

• A. different physical but the same chemical properties
• B. different chemical but the same physical properties
• C. the same chemical and physical properties
• D. different atomic structure
• E. the same position in the periodic table

Question 9

Which of the following substances is the most abundant in the universe?

jamb 1985

• A. Carbon
• B. Air
• C. Water
• D. Oxygen
• E. Hydrogen