If element X has 99 protons, how many electrons does it have

The temperature of a 95.4 g piece of Cu increases from 25.0 °C to 48.0 °C when the Cu absorbs 849 J of heat. What is the specifc heat of Cu

Which of the following is a classification for a type of chemical reaction? Implosion, Combustion, Explosion, Deconstruction

Why is it important for scientist to montior meteors in the sky?

Without looking at the periodic table write the expected outer electron configuration for each of the following elements: A. Group 7, fourth period B. Group 3, fifth period C. Group 12, sixth period

Why are valence electrons important? Why do elements bond? What are two ways elements complete their valence?

Which term best describes the type of bonding in magnesium chloride

This equation indicates that the reaction gives off heat. What is this type of reaction called? 2C4H10 + ? O2? 8CO2 + 10H2O + heat a. an exothermic reaction b. an endothermic reaction c. absorption reaction d. precipitation reaction

Given the balanced equation representing a reaction: C3H8 (g) + 5O2 (g) = = >3CO2 (g) + 4H2O (g) What is the total number of moles of O2 (g) required for the complete combustion of 1.5 moles of C3H8 (g) ? (1) 0.30 mol (3) 4.5 mol (2) 1.5 mol (4) 7.

What increases in equal steps of one from left to right in the Periodic Table for the elements lithium to neon?

The organisms living together in a community are interdependent upon one another. Look at the food web below. In which of the following ways is a puffin dependent upon salmon? A. Puffins have a commensalistic relationship with salmon. B.