Which element is needed for

a. Bone and teeth formation.

b. Treatment of water.

Identify an ionic bond. identify an ionic bond. neutrons are lost. protons are pooled. electrons are transferred. protons are shared. electrons are gained.

Choose the element described by the following electron configuration. 1s22s22p63s23p64s1

Carbon has different isotopes. What is different between an atom of 12C and an atom of 13C? A. number of protons in the nucleus B. number of neutrons in the nucleus C. number of electrons in the atom D. number of protons and electrons in the atom

How do humans spread organisms around the world?

Which of the following elements is the most metallic? a. K b. KR c. FE d. CU

Which pair of elements can form an ionic compound? A) Two atoms of hydrogen B) One atom of sodium and one atom of fluorine C) One atom of calcium and one atom of chlorine D) Two atoms of hydrogen and one atom of oxygen

If 9.96 L of gas at 13°C and 2.28 atm is compressed at a pressure of 133 atm and 29°C, calculate the

In a piece of silver where would you find the valence electrons

Reactions cannot occur without a certain minimum amount of energy. what is this minimum amount of energy called?

Which of the following characteristics do all plants share? a. being unicellular b. producing flowers c. being a prokaryote d. being an autotroph