Atomic models

In this model atoms were composed of both negative (electrons) and positive (protons) parts. Most of the mass was in a tiny nucleus, and electrons moved around it with almost no order

• Dalton

• Quantum model

• Rutherford

• Thomson

The ________ model believed each atom was like a billiard ball and couldn't be broken down into small parts.

• First atom model

• Modern atomic model

• Bohr´s atomic model

All matter is composed of fundamental building blocks. _______ is the smallest unit of matter that retains all of the chemical properties of an element.

• An atom

• A cell

• A molecule

Choose the correct sentence.

• An atom is made of three sub-atomic particles, a positively charged electron, a negatively charged proton, and a neutral neutron.

• An atom is made of three sub-atomic particles, a negatively charged electron, a positively charged proton, and a neutral nucleus

• An atom is made of three sub-atomic particles, a negatively charged electron, a positively charged proton, and a neutral neutron.

The atomic number is defined by the number of:

• Orbits

• Neutrons

• Protons

• electrons

The third atomic model believed atoms were composed of negative particles, arranged in a positive ball

• Thomson

• Rutherford

• Dalton

• Bohr

What is the centre of an atom called?

• The protons

• The nucleus

• The electrons

• The nucleolus

The atomic number is defined by the number of:

• Orbits

• Neutrons

• Protons

• electrons

This model is the most accurate but also hardest to understand. Electrons don't have exact orbits. They have fuzzy areas where they are allowed to move around, but scientists can never say exactly where an electron is located.

• Rutherford model

• Neither of the options

• Dalton model

• Thomson model

Someone proposed an atomic model that was the first one, and thus had not even electrons. This model was...

• Bohr's

• Rutherdord´s

• Dalton´s

• Thomson