Q.1.
An electron has a _____ charge.
Q.2.
Choose the particle that has no charge.
Q.3.
The area around the nucleus where elections are located
Q.4.
The first energy level can hold up to, how many electrons?
Q.5.
What does the nucleus consist of?
Q.6.
Which particle has a similar mass to a proton?
Q.7.
How many electrons are in the element oxygen?
Q.8.
What is the atomic number for an element with three protons?
Q.9.
Which statement best describes an electron?
Q.10.
The quantum of light is
Q.11.
For principal quantum number n=the total number of orbitals having l=3 is
Q.12.
Which is the isotone of 32Ge(atomic numberXmass number)
Q.13.
Which of the following has the maximum number of unpaired d-electrons?
Q.14.
Uncertainity in the position of an electron (mass= 9.1 x 10-kg) moving with a velocitym/s, accurate upto 0.will be
Q.15.
The maximum kinetic energy of photoelectrons ejected from a metal, when it is irradiated with radiation of frequency 2 xs-1 is 6.x 10-J. The threshold frequency of the metal is
Q.16.
Which of the following is isoelectronic with Ca2+
Q.17.
The sub-shell with n=l=2 can accomodate a maximum of
Q.18.
Which of the following radiations has largest energy?
Q.19.
The energy of an electron in 3rd orbit of hydrogen atom is:
Q.20.
The radius of first orbit of hydrogen is 0.Å. The radius of second orbit would be