Question

1. what is the symbol and atomic number of the element with the most protons according to this periodic table? click on its name to find out what year it was discovered. 7. which elements are liquids in room temperature? 8. reduce the temperature value to -200 degree celsius, using the control or typing \-200\ (shown in which ones are the gases at that temperature? which ones are liquids? 9. a large value for thermal conductivity means that the element is a strong conductor of heat, whereas a small value means the element is a weak conductor. click on the term \conductivity, thermal\ from the left tab. name two elements that are the strongest conductors of heat

Explanation:

1. The element with the highest atomic number (most protons) as of now is Oganesson (Og) with atomic number 118. Its discovery year can be found by referring to reliable scientific sources.
2. At room - temperature (approx. 20 - 25°C), mercury (Hg) and bromine (Br) are liquids.
3. At - 200°C, many light gases like hydrogen (H₂), helium (He), neon (Ne), etc. remain as gases. Liquids at this temperature depend on the substances present, but substances like some cryogenic liquids (e.g., some liquid nitrogen - like substances if present) may be in liquid state.
4. Silver (Ag) and copper (Cu) are among the strongest conductors of heat.

Answer:

1. Symbol: Og, Atomic number: 118
2. Mercury (Hg), Bromine (Br)
3. Gases: Hydrogen (H₂), Helium (He) etc.; Liquids: Depends on substances present (e.g., some cryogenic liquids)
4. Silver (Ag), Copper (Cu)