If an isotope of uranium, uranium-235, has 92 protons, how many protons does the isotope uranium-28 have?

An element has an atomic number of 22 what is the total number of valance electrons?

How much heat is released when 345 g of tin is cooled from 210.0 degrees * C to 0.0 C? (C = 0.220 J/gC)

To observe small object

What's the difference between the bulk properties of a material and the surface properties?

What substance is combination of different atoms

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