Chemistry1 - Sem1 Final Exam Study Guide

Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.

Electronegativity decreases down a group/family.

Isotopes are atoms of the same element that have a different number of neutrons.

You can tell them apart by the difference in their mass numbers.

Accuracy is how close measurements are to the accepted value; precision is how close measurements are to one another.

Take the mass of each isotope multiplied by its relative abundance (in decimal form), and then add these products together.

Significant figures are the digits in a number that contribute to its precision.

3 significant figures.

The atomic number is the number of protons in the nucleus of an atom.

The mass number is the total number of protons and neutrons in an atom's nucleus.