Why did mendeleev leave blank spots in his periodic table?

Which monatomic ion has a charge of 1 - and the condensed electron configuration [ne]3s23p6?

The PVT behavior of a certain gas is described by the equation of state: P (? - ?) = ? T, where? is a constant. If in addition c? is constant, show that: (a) ? is a function of T only. (b) ? = const.

If a scientist has an initial sample of 200 g of carbon-14, how much will remain after one half-life?

Can a new element be discovered and be placed in between copper and nickel on the periodic table? Explain your answer.

Na2SO4 is dissolved in water to make 450mL of a 0.2250 M solution. What is the molar mass of Na2SO4?

Where are alkaline earth metals found on the periodic table

IKI will turn deep purple in the presence of starch. Which term is applied to IKI in this situation? A. indicator B. litmus C. modifier D. product

How many electrons are in the 2p sublevel of nitrogen?

Which answer choice correctly lists the elements found in Period 2 of the periodic table? A. oxygen, fluorine, neon B. sodium, magnesium, aluminum C. nitrogen, phosphorus, arsenic D. beryllium, magnesium, calcium

Write the chemical formula for each compound described. a) barium chloride (1 Ba ion, 2 Cl ion)