Atomic Theory

Which part of the atomic theory did Niels Bohr prove?

• there are electrons

• there is a nucleus

• electrons are in energy levels

• gold foil experiment

Which part of the atomic theory did JJ Thomson prove?

• there are electrons

• electrons are in energy levels

• there is a nucleus

• cathode ray tube

What experiment did JJ Thomson use?

• gold foil experiment

• cathode ray tube experiment

John Dalton wrote postulates to make the idea of the atom useful. Which postulate below was proven wrong?

• All elements are made up of tiny indivisible particles called atoms.

• The atoms of one element are different from the atoms of another element.

• Atoms of different elements chemically combine to form chemical compounds.

• During chemical reactions, atoms are rearranged.

JJ Thomson came up with which model for the atom?

• planetary model

• electron cloud model

• plum pudding model

• nuclear model

Which statement is incorrect?

• The nucleus is very dense.

• The nucleus contains protons and neutrons.

• The nucleus is positively charged.

• The nucleus is involved in chemical reactions.

Tags

NGSS.HS-PS1-8

The number of protons is equal to the number of electrons for an atom. This means an atom is-

• electrically neutral

• electrically positive

• electrically negative

Tags

NGSS.HS-PS1-7

What determines chemical reactivity?

• protons

• neutrons

• electrons

• isotopes

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What determines the identity of the atom?

• protons

• neutrons

• electrons

• isotopes

Which subatomic particle has a neutral charge?

• protons

• neutrons

• electrons

• isotope