What element has 3 valance electrons and 4 energy levels

What happens inside an atom that causes it to give off light?

Which contains more molecules of water, 4.55 cm3 of ice (0.917 g/cm3) at 0◦C or 4.55 cm3 of liquid water at 0◦C? 1. the ice 2. the liquid? How many more molecules? Answer in units of molec.

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?

How many grams of magnesium are consumed to produce 35.2 liters of mgO

1. For each of the following compounds label all protons with the predicted splitting pattern it would exhibit in a 1H-NMR spectrum A) 3-Hydroxyacetophenone B) Acetophenone C) 3-Methylbenzaldehyde D) 4-Hydroxy-3-methoxybenzaldehyde (vanillin)

Which statement is true about inorganic compounds? A. They are not made of atoms. B. They contain carbon. C. They are not made from living things. D. They are all elements.

Which domain do you find the most interesting why

Complete the matching exercise below by choosing the correct description of each bond type in aqueous solution. 1. covalent bond 2. hydrogen bond 3. electrons shared by atoms a. electrons shared by atoms b.

One mole of calcium ions has the same number of representative particles as which of the following? one mole of calcium nuclei one mole of calcium atoms 6.02 x 1023 calcium ions All of these are correct.

How is chemical symbol and chemical formula difference?