State the electric charge of the nucleus He 2 3

The nucleus of He 2 3 consists of 2 protons each having a charge of + 1 unit i.e total of two positive charges and 1 neutron which does not have any charge Thus the total charge on this nucleus is + 2 . However, the atom also has 2 electrons each with - 1 charge, so that the atom as a whole is neutral

State two ways in which the nuclei of isotopes O 8 16 and O 8 18 differs from each other( other than they have different neutrons.

The isotopes contain the same number of protons hence have similar chemical properties but a different numbers of neutrons. The different numbers of neutrons cause: (1) a difference in the atomic weight or mass of the atoms and some physical properties. (2) The difference in the ratio between the number of protons (the number of protons stays the same) and the number of neutrons creates a difference in the nuclear reactions of the isotopes.

E M B I B E

Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 4

HARD

Diploma

IMPORTANT

Earn 100

Refer to the figure, explain why the distance between the emission lines of hydrogen decreases as we move to the right

Important Questions on Atomic, Nuclear and Particle Physics

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 5

A hydrogen atom is in its ground state. Explain the term 'ground state'.

HARD

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 5

A hydrogen atom is in its ground state. Explain the term 'ground state'. Photons of energy $10 . 4 eV$ are directed at hydrogen gas in its ground state. Suggest what, if anything, will happen to the hydrogen atoms.

HARD

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 5

A hydrogen atom is in its ground state. Explain the term 'ground state'.

In another experiment, a beam of electrons of energy $10 eV$ is directed at hydrogen gas atoms in their ground state. Suggest what, if anything, will happen to the hydrogen atoms and the electrons in the beam.

MEDIUM

Diploma

IMPORTANT

Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 6

State the electric charge of the nucleus