What does the periodic table show us?
The periodic table shows us the elements, it is arranged by their atomic numbers and electron configuration
What is a mass number? It shows us the mass number which is the number of protons and neutrons in a nucleus.
What is an atom? An atom is a very small particle that makes up everything around us, it consists of three particles, electrons, protons, and neutrons.
What are alkali metals? An alkali metal is any of the six chemical elements that make n Group 1 of the periodic table. It's the first collum on the periodic table- lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). They react with other elements because they want to get rid of the one-electron they have.
What happened during the demonstration? The teacher put lithium into the water and it changed the colour, then she used sodium and it created a small fire on the water but in the end, it made a small explosion.
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