How many valence electrons are in a stable ion of a period 4 metal?

This chart represents the melting point of several substance. what besy explains the high melting point of the salt?

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.