History & Basics of Atoms

According to the modern atomic theory

According to rutherford,

Atoms are the building blocks of matter

An iron atom has a mass number of 56. Its atomic number is 26. How many neutrons does the iron atom have?

Each element has a unique number of

What do scientists use to predict the locations of electrons in atoms?

Thomson discovered negatively charged particles called

Which scientist atomic model is similar to a chocolate chip cookie?

An element’s atomic number is equal to its number of

Protons and electrons are almost identical in size and mass.

Which experiment was conducted by Rutherford?

Dalton suggested that the universe was made of indivisible units.

Electrons located on the inner most energy level are called valence electrons.

Democritus thought that matter was made of tiny particles

Positive and negative charges are held together by the

A charged atom is called an

Isotopes are atoms of the same element with