Please help I will mark brainliest Does ZnS, MnS, NiS and CoS (Group IV Sulphides) dissolve in dil. HCl?
And I want to know the reasons

If a planet rotates 360 degrees during a 24 hour time period, what does that tell us about the planet? a. the middle of the planet is in darkness b. the seasons on the planet vary every day. c. the planet runs on a 12-hour time clock. d. the temperature on the planet varies daily.

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass