How many valence electrons are present in the atoms of element with atomic number 51

In which reaction is precipitation occurring?

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat

Two nails have identical sizes and shapes. in one nail, 20 percent of the domains are lined up. in the other nail, 80 percent of the domains are lined up. which has stronger magnetic force? first answer gets brainliest!