Answer the following questions. TO EARN BRAINLIEST: ALL QUESTIONS SHOULD BE ANSWERED AND THE ANSWERS SHOULD BE CORRECT

The Periodic Table

Q1. Differentiate between the following:
~ Physical properties and chemical properties
~ Element and a compound

Q2. Define the terms periods and groups present in the periodic table.

Q3. Write down the properties of Halogens


Q4. The chlorine oxide is unstable and is difficult to make, so the pH of this oxide in water is unknown. If we could make some chlorine oxide, suggest what effect it would have on the pH when added to water.


Q5. Look at the periodic table.
a. Why did Mendeleev choose to put certain elements in the same group?
b. In what order did Mendeleev place the elements in the original periodic table?


Q6. Write down the international symbols of the following elements:
calcium
barium
helium
neon

Q7:Complete the following chemical equations.
a. sodium + water ------->
b. sodium + oxygen ----->
c. State what would you observe if you add a piece of sodium in water?


Q8. Why are silicon and germanium described as semi-metals?