Which two elements have the same number of valence electrons?

A.) Na and Sr

B.) Zr and H

C.) O and S

D.) Mg and P

Acidis are, which means that they "eat away"at other materials

Which of the following is an example of chemical weathering? A. Frost wedging B. Animal activity C. Oxidation D. Abrasion

What are the building blocks of all matter

When is the potential energy between two atoms at zero? Question options: A. When the atoms were close to one another B. When the atoms were far from one another C. When the atoms form a bond

How will temperature affect the spontaneity of a reaction with positive triangleH and triangleS? A. Changing the temperature will not affect spontaneity. B. A low temperature will make it spontaneous. C. A high temperature will make it spontaneous.

Which element has an isotope mass number of 32 and is used as an ecological tracer?

Which laws can be combined to form the ideal gas law? Boyle's law and Charles's law Gay-Lussac's law and Avogadro's law Charles's law, Avogadro's law, and Boyle's law Dalton's law, Gay-Lussac's law, and Avogadro's law

What determines the horizontal arrangement of the periodic table?

A 55.3 g sample of lead heated and then quenched in a 175g sample of water. During the quenching reaction the temperature of the water increases from room temperature, 25.0 °C, to 42.6 °C.

What conclusion can you draw from this experiment about the components of the black ink