How many valence electrons does beryllium have

In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the (1) activation energy (2) entropy of the system (3) heat of fusion (4) heat of reaction

4. Which of the following elements is stable? A. Fluorine, atomic number 9 B. Carbon, atomic number 6 C. Boron, atomic number 5 D. Neon, atomic number 10

What is the mass of an atom that has 2 protons, 3 neutrons, and 2 electrons? 2 3 5 7

How is coal formed?

20. What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to the correct number of significant figures. a. 128 cm2 b. 1280 cm? 1280.3 cm? d. 1280.32 cm 128.0319 cm? C. e.

Part I Complete and balance the following equation: NO-2 (aq) + Al (s) →NH+4 (aq) + AlO-2 (aq) (basic solution)

A 425.00-gram sample of a compound decomposes into 196.01 grams of carbon, 41.14 grams of hydrogen, 130.56 grams of oxygen, and 57.29 grams of silicon. Experiments have shown the compound has a molecular weight of 208.329.

What characters do all minerals share

Which type of photons in the electromagnetic spectrum contain the least amount of energy?

What is the best reason for the difference in properties of LiCl and C6H14O? LiCl and C6H14O have different atomic masses. Cl and O belong to different groups of the periodic table. One compound is ionic, and the other is metallic.