structure of an atom

what jj thomson proposed for model of atom?

• An atom consists of a positively charged sphere and the electrons are embedded in it.

• only certain special orbits known as discrete orbits of electrons are allowed inside the atom

• both a and d

• the negative and positive charges are equal in magnitude . so, the atom as a whole is electrically neutral

who discovered neutrons and when?

what is the valency of L shell?

• 2

• 5+

• 8

• 4

what are the isotopes of carbon?

• c12 and c14

• c15

• none of these

• c14

isobars are what

• whose atomic number is equal to the number of protons

• whose atomic number is different but mass number is same

• whose atomic number is same but mass number is different

• no of neutrons

• no of electrons

who is this person ?

• Chadwick

• e rutherford

• JJ Thomson

• Neils Bohr

what are canal rays

• canal rays are positively charged radiations

• canal rays are electrically charged radiations

• canal rays are negatively charged radiations

• canal rays are neutrally charged radiations