Final Exam Review - Perry

An endothermic reaction is a chemical reaction that absorbs heat from its surroundings, resulting in a decrease in temperature.

An exothermic reaction is a chemical reaction that releases heat to its surroundings, resulting in an increase in temperature.

Krypton, which is located in period 4 of the periodic table.

3, which means it has 3 protons.

20 neutrons.

Protons determine the atomic number and identity of an element.

A Bohr model is a diagram that represents the arrangement of electrons in an atom, showing energy levels.

The atomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu).

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

The periodic table is a tabular arrangement of elements organized by increasing atomic number, showing periodic trends.