Reactivity and Properties of Elements

This video covers the history and structure of the periodic table, highlighting Dmitri Mendeleev's contributions and predictions. It explains the modern periodic table's organization by atomic number and discusses the properties and reactivity of Group 1 alkali metals, Group 7 halogens, and Group 0 noble gases. The video also explores electron configurations and displacement reactions.

Who is often credited as the father of the modern periodic table?

• Antoine Lavoisier

• John Newlands

• Dmitri Mendeleev

• Henry Moseley

What is the primary basis for ordering elements in the modern periodic table?

• Atomic number

• Melting point

• Atomic mass

• Density

How many main groups are there in the periodic table?

• 7

• 10

• 8

• 9

What does the group number indicate about an element's electron configuration?

• Total number of electrons

• Number of electrons in the outer shell

• Number of electron shells

• Number of protons

Which of the following is NOT an alkali metal?

• Lithium

• Sodium

• Potassium

• Calcium

What happens when potassium is added to water?

• It forms a green flame

• It remains unchanged

• It sinks and dissolves slowly

• It forms a lilac flame

Why do alkali metals become more reactive as you move down the group?

• Their outer electron is further from the nucleus

• Their outer electron is closer to the nucleus

• They have fewer electron shells

• They have more protons

Which halogen is the most reactive?

• Fluorine

• Chlorine

• Bromine

• Iodine

What is a characteristic property of noble gases?

• Highly reactive

• Forming colorful compounds

• Inert and non-reactive

• High melting points

What type of reaction involves a more reactive element displacing a less reactive one?

• Decomposition reaction

• Synthesis reaction

• Displacement reaction

• Combustion reaction