Online Introductory Chemistry

Atoms and the Periodic Table

Dr. Walt Volland revised April 17, 2010 all rights reserved

Answers to formative pretest true false questions for Lesson 3 Atoms, Energy levels, & the periodic table. These questions are a quick overview of the topics in this lesson. You are not expected to know this material before hand. The questions are intended to help you focus on material in the lesson. After you have studied the lesson you should be able to answer these and even more complicated questions.

	1.	F	Neutrons are subatomic particles with a positive charge.
	2.	F	The atomic nucleus contains electrons and neutrons.
	3.	T	All atoms of the same element have the same number of protons.
	4.	F	Protons are more massive than neutrons.
	5.	F	Protons repel electrons because they have the same charge.
	6.	T	All electrons have a relative minus one charge.
	7.	T	Electrons repel electrons because they all have the same charge.
	8.	T	Atomic numbers are all whole numbers like 1, 2, etc.
	9.	T	Mendeleev proposed the forerunner of the modern periodic table
	10.	T	Elements in the same vertical group show similar properties.
	11.	T	Horizontal rows in the periodic table are called "periods".
	12.	T	Elements in the periodic table are arranged in order of increasing atomic number.
	13.	T	Electrons show magnetic character.
	14.	F	Valence electrons are electrons close to the nucleus of the atom.
	15.	F	Chlorine is an example of a metal.
	16.	F	Sodium, Na, is a p-block element.
	17.	F	Isotopes are atoms of the same element with different numbers of electrons.
	18.	T	The electron configuration for the six electrons in carbon is 1s22s22p2
	19.	F	The lowest value for the quantum number "n" is zero,
	20.	F	An atom with the electron configuration 1s22s2 2p1 has one valence electron.