Introduction to Atoms and Atomic Notation

The video tutorial explains the structure of atoms, highlighting the nucleus composed of protons and neutrons, and the surrounding electrons. It covers atomic notation, isotopes, and the arrangement of electrons in energy levels. The tutorial also distinguishes between atoms and ions, using lithium as an example to illustrate these concepts.

What is the main reason why atoms are mostly empty space?

• Electrons are larger than protons.

• Atoms are filled with air.

• The nucleus is very small compared to the atom.

• Protons and neutrons are spread out evenly.

How can you calculate the number of neutrons in an atom?

• Add the atomic number to the mass number.

• Divide the mass number by the atomic number.

• Subtract the atomic number from the mass number.

• Multiply the atomic number by the mass number.

What is an isotope?

• An atom with a different number of protons.

• An atom with a different number of energy levels.

• An atom with a different number of electrons.

• An atom with a different number of neutrons.

What happens when an electron absorbs electromagnetic radiation?

• It becomes a proton.

• It moves to a higher energy level.

• It moves to a lower energy level.

• It becomes a neutron.

How does a neutral atom become a positively charged ion?

• By losing electrons.

• By gaining electrons.

• By losing protons.

• By gaining protons.