O elemento a seguir tem tendência em formar cátion ou ânion? Justifique. 1s2 2s2 2p6 3s2 3p5 AJUD PFV

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead