Calcium (atomic number 20) has electron configuration 1s2,2s2,2p6,3s2,3p6,4s2. The atomic number of scandium is 21. Which orbital does the 21st electron enter?

a. 3d b. 4p c. 4d d. 4f

In an ionic bond: A. One atom accepts electrons from another. B. The atoms swap electrons. C. Both atoms share their electrons. D. The atoms attract each other but their electrons do not interact.

The required orbital speed:

The hydrostatic pressure that makes a diluted solution diffuse solvent molecules across a semipermeable membrane into a concentrated solution is known as A. osmotic pressure. B. ambient pressure. C. absorption pressure. D. adsorption pressure.

Who is issac newton?

Which of the following is the correct chemical formula for Na and S? Na2S NaS2 NaS

For the reaction CO+2H2=CH3OH at 700 K, equilibrium concentrations are [H2]=0.072 M, [CO] = 0.020M, and [CH3OH] = 0.030 M. Calculate K

How to make fluffy slime without contact solution?

When you mixed 20 grams of magnesium and an excess of nitric acid, 1.7 grams of hydrogen was actually produced. What is the percent yield of hydrogen during this reaction? Mg + 2HNO3 Mg (NO3) 2 + H2 3.3 % 48.5 % 25.7 % 102 % 98 %

A small cubical furnace 50 by 50 by 50 cm on the inside is constructed of fireclay brick [k = 1.04 W/m. degree C] with a wall thickness of 10 cm. The inside of the furnace is maintained at 500 degree C, and the outside is maintained at 50 degree C.

What is the molar mass of Al2 (SO4) 3?150.03 g/mol 278.03 g/mol 342.17 g/mol 450.09 g/mol