Sodium (NA) and potassium (K) are in the same group in the periodic table. Sodium is in the 11th position. How many valence electrons does potassium have? A) 0 B) 1 C) 9 D) 11

In which of the following is light energy converted to electrical energy a bulb b battery c solar cell d oil lamp

A mixture of Ar, He, and O2 has a total pressure of 1,015 kPa. Argon exerts a partial pressure of 152 kPa and Helium exerts a partial pressure of 305 kPa. What is the partial pressure of oxygen in this mixture? a. 1,472 kPa b. 558 kPa c. 863 kPa d.

The part of the atom that accounts for electricity is the a. electron. b. nucleus. c. neutron. d. proton.

Give the approximate bond angle for a molecule with a trigonal planar shape. A) 109.5° B) 180° C) 120° D) 105° E) 90°

What is the National Suicide rate for Teens?

Is the earth older than any of they rock layers

What will be the charge of sulfur

The eight most common elements in Earth's crust are: O, Si, Al, Fe, Ca, Na, K, and Mg. These elements account for 98% of the atoms in Earth's crust.

A single electron can have the following set of quantum numbers: n=3, l=2, ml=0, ms = - 1/2. True or False

What shape is the magnetic field produced when current is passed through a wire? a. Parabolic b. Elliptical c. Circular d. Bimodal