Online Introductory Chemistry
Atoms and the Periodic Table
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.
