Atomic Theory and Atomic Structure Flashcard

Front

What happens to the charge of an atom when it loses electrons?

Back

The charge becomes positive.

Front

Who claimed that matter was made of small, hard particles called 'atomos'?

Back

Democritus.

Front

What is the symbol for a Bromine ion that gains 1 electron?

Back

Br^-1.

Front

What did Niels Bohr prove about electrons?

Back

Electrons are in energy levels.

Front

What is the correct order of scientists related to atomic theory from earliest to most recent?

Back

Democritus, John Dalton, JJ Thomson, Ernest Rutherford.

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What is the nucleus of an atom?

Back

The central part of an atom, containing protons and neutrons.

Front

What are protons?

Back

Positively charged particles found in the nucleus of an atom.

Front

What are neutrons?

Back

Neutral particles found in the nucleus of an atom.

Front

What are electrons?

Back

Negatively charged particles that orbit the nucleus of an atom.