The first three periods are
A. long periods
B. short periods
C. moderate periods
D. all of above
Related Questions on Chapter 4: Periodic Table & Periodicity Chemistry Mcqs for High School - Grade 9
Both elements of 1st period contain valence electrons in
A. M shell
B. N shell
C. K shell
D. S shell
In the periodic table, helium is placed at
A. top left corner
B. bottom right corner
C. bottom left corner
D. top right corner
Across the period the atomic size decreases due to
A. shielding effect
B. photoelectric effect
C. increase in nuclear force of attraction
D. decrease in nuclear force of attraction
On basis of electronic configuration the group and period of ⁹₅B is
A. 2 and IIIA
B. 3 and IIA
C. 4 and VIA
D. 5 and VIIA
Chemical properties depend upon
A. electronic configuration
B. valence shell electronic configuration
C. atomic mass
D. atomic size