....came up with the atomic theory.

Elements are... (you can choose more than one answers)

• Consist of atoms of two or more elements

• Composed of the same type of atoms

• Represented by atomic symbols

• Represented by a chemical formula

How do we call the latest atomic model?

• Thomson’s

  ”Plum pudding” model

• Bohr model

• Schrödinger’s

  Quantum mechanical model

• Rutherford’s “Planetary model”

The electrons have...

• Particle-like behavior

• Wave-like behavior

• Particle- AND wave-like behavior

• unpolite behavior

What's new in the latest atomic model?

• the discovery of electrons

• electrons move around the nucleus in waves

• the discovery of nucleus

• an atom is mostly empty space

If we compare the size of the nucleus to the atom's, it's like...

• a grain of sand vs a sandbox

• a grain of rice vs a bowl

• a football vs the Earth

• an ant vs a football field

The nucleus contains protons and...

The nucleus is...

• positively charged

• negatively charged

• neutral

• it depends

Choose the right answer about atoms.

• An atom is made up of 4 types of subatomic particles.

• All atoms are neutral.

• Atoms can be positively or negatively charged.

• The number of neutrons in an atom is always the same as the number of protons.

Choose the FALSE answer.

• The atomic number of an element tells us the number of protons and the number of electrons as well.

• The mass number is not the same as the atomic mass.

• One element can have more mass numbers, but only one atomic number.

• You can find both the atomic number and the mass number of an element in the periodic table.