What can we tell from the column that an element is in?

The year the element was discovered

The number of protons in the nucleus

The number of electrons in the outer energy level

The mass of the atom

What are the four characteristics of minerals

How is geometrical symmetry related to the polarity of a molecule? An asymmetrical molecule is always nonpolar. An asymmetrical molecule can never be polar. A symmetrical molecule is always nonpolar. A symmetrical molecule is always polar.

Zinc has a mass of 4.50g calculate the volume

Problem 1: For which of the following activities might you want to hire a chemist? A. building a garage B. testing a sample of water from a well C. finding a comet D.

Which of the following techniques involves separating volatile chemical into their components? a. UV spectrophotometry b. DNA analysis c. Gas chromatography d. Infrared spectrophotometry

Be sure to answer all parts. Which product (s) form (s) at each electrode in the aqueous electrolysis of the following salts? Select as many as apply.

True or false. elements in the same period have the same number of valence electrons

A base a. causes phenolphthalein indicator to change from colorless to pink. b. donates a proton in a proton transfer reaction. c. accepts electrons in an electron transfer reaction. d. produces hydrogen ions in solution. e. does none of the above.

Which of these is an indicator that a chemical reaction has occurred? precipitate forms temperature remains the same color is diluted mass increases

The half-life of isotope X is 3 days, how long will it take for one half of 10g sample to decay