What is the mass number of an oxygen isotope that has nine neutrons? what is the name of this isotope?

Which of the following statements is true? Ca does not react with other atoms because it has 8 electrons in its outermost shell. Mg does not react with other atoms because its outermost shell is complete.

Select the equations that are correctly balanced. a. H2O + 2O2 → H2O2 b. Fe2O3 + 3H2 → 2Fe + 3H2O c. Al + 3Br2 → AlBr3 d. CaCO3 → CaO + CO2

The primary reason some parts of Earth are hotter than other parties because the hotter parts of Earth

What term best describes ammonia

Which object is visible only by reflection? a. the sun b. earth's moon c. a candle flame eliminate d. a bolt of lightening

Amber has developed a line of organic lotions and handmade soaps with unique, herb-based scents and a touch of bee balm. She plans to sell these products to the wealthy residents of a nearby resort town.

Two pure elements react to form a compound. One element is an alkali metal, X, and the other element is a halogen, Z. Which of the following is the most valid scientific claim that can be made about the compound? a. It has the formula XZ2 b.

Are protons positive and neutrons neutral

Why might it be useful to determine the elements that a planet or moon is made up of?

Which of these is an example of a solution A Sand stirred in water B Sugar stirred in tea C A glass of water with ice in it D Oil and vinegar in a salad dressing jar