Could i get which of the following is true about the mass of an object? it is equal to its weight. it is proportional to its weight. it is always more than its weight. it changes at different locations.

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?

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy