electrovalency
electron affinity
electropositivity
electronegativity
Correct answer is D
No explanation has been provided for this answer.
22688Ra → x86Rn + α - particle
What is the value of x in the nuclear reaction above?
220
222
226
227
Correct answer is B
22688Ra → 22286Rn + α - particle
spherical
elliptical
spiral
circular
Correct answer is A
No explanation has been provided for this answer.
An electron can be added to a halogen atom to form a halide ion with
2 valence electrons
3 valence electrons
7 valence electrons
8 valence electrons
Correct answer is D
No explanation has been provided for this answer.
5s
20s
40s
60s
Correct answer is C
Relative molecular mass of CH4 = 12 * 1 + 4 = 16
Relative molecular mass of SO2 = 32 + 10 *2 = 64
tSO2/tCH4 = √MSO2/MCH4
t/20 = √64/16 = √4
t/20 = 2
∴ t = 20 * 2 = 40sec