The arrangement of particles in crystal lattices can be studied using
X - rays
γ - rays
α - rays
β - rays
Correct answer is A
No explanation has been provided for this answer.
The molecular lattice of iodine is held together by
dative bond
metallic bond
hydrogen bond
van der Waal's forces
Correct answer is D
No explanation has been provided for this answer.
An isotope has an atomic number of 15 and a mass number of 31. The number of protons it contain is
16
15
46
31
Correct answer is B
No explanation has been provided for this answer.
6.9
7.1
6.2
6.8
Correct answer is A
R.A.M = m\(_1 \alpha_1\) + m\(_2 \alpha_2\)
= 7(90/100) + 6(10/100)
= 6.3 + 0.6
= 6.9
Which of the following questions is correct about the periodic table?
The non-metallic properties of the elements tend to decrease across each period
The valence electrons of the elements increase progressively across the period
Elements in the same group have the same numbeer of electron shells
Elements in the same period have the number of valence electrons
Correct answer is B
No explanation has been provided for this answer.