The de Broglie wavelength of an electron with a velocity of 7.40 × 106 m/s is ________ m. The mass of the electron is 9.11 × 10-28 g.

Give the complete electronic configuration for Br-.

Which of the following elements is a alkali metal?

Which reaction below represents the first ionization of O?

Give the complete electronic configuration for Ca2+.

Give the complete electronic configuration for S2-.

A substance that can’t be chemically broken down into simpler substances is

Choose the heterogeneous mixture from the list below.

How many different values of ml are possible in the 6f sublevel?

Calculate the mass (in kg) of 4.87 × 1025 atoms of Zn.