Unit 3:Atomic Theory and the Periodic Table

How many protons and neutrons are in the isotope Bromine-85?

Elements in the alkali metals group have _____ valence electrons

Which isotope has 12 protons and 15 neutrons?

Identify the isotope of an element that has a mass number of 14 and 8 neutrons in the nucleus.

Electons and _____________ are equal in number in a typical (neutral) atom.

Elements in the Oxygen family have:

Each energy level outside the nucleus of an atom has a miximum number of_________ it can hold.

How would you classify the following elements: Ca and Mg?

Most elements on the Periodic Table are in what state of matter at room temperature?

The number of protons in one atom of an element is always that element's:

An isotope of an atom has 24 protons, 30 neutrons and 24 electrons. The mass number is:

Which of the following elements on the Periodic Table would have 5 valence electrons?

Which subatomic particle has a negative charge?

Atoms of the same element with differing numbers of neutrons are called:

When drawing a Bohr model for an atom the maximum number of electrons on the first energy level

Which of the following groups are most likely to have members that are gases at room temp?