The element in Period 4 and Group 1 of the Periodic Table would be classified as a

A. metal

B. metalloid

C. nonmetal

D. noble gas

An electron that is in the highest energy level of an atom and determines the atom's chemical properties is called a (n) paired electron. opposite-spin electron. valence electron. extra electron.

What is the trend in electronegativity for elements on the periodic table? It decreases across a period and increases down a group. It decreases across a period and decreases down a group. It increases across a period and increases down a group.

Explain how you determine molar mass of Ca (No3) 2

Which formula correctly represents the product of an reaction between ethane and chlorine

Which determines the state of matter for any material

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.

Which of the following best describes what causes the phases of the moon? The alignment of the sun, Earth, and moon The speed of the moon around the Earth The speed of the Earth around the sun The alignment of the planets