Question

who discovered the nucleus?
crookes
rutherford
proust
thomson

1. drag and drop the words with the descriptions.

the smallest unit of an element that maintains all of the chemical properties of that element
an element that gains or loses an electron
an element that has a different number of neutrons than protons
a substance made up of two or more different elements chemically bonded together
the subatomic particle with the smallest mass
choices: atom, ion, electron, compound, isotope

Explanation:

Ernest Rutherford discovered the nucleus through his gold - foil experiment. An atom is the smallest unit of an element maintaining its chemical properties. An ion is an element that gains or loses an electron. An isotope is an element with a different number of neutrons than protons. A compound is made up of two or more different elements chemically bonded. The electron is the subatomic particle with the smallest mass.

Answer:

1. Who discovered the nucleus?

• B. Rutherford

1. Drag and drop the words with the descriptions:

• the smallest unit of an element that maintains all of the chemical properties of that element: atom
• an element that gains or loses an electron: ion
• an element that has a different number of neutrons than protons: isotope
• a substance made up of two or more different elements chemically bonded together: compound
• the subatomic particle with the smallest mass: electron