Test: Atomic Structure Flashcards
- Substances that cannot be broken down chemically into other substances are
Elements
4.Each family in the periodic has its own characteristic properties based on the number of
Valence electrons
6.The atomic number of magnesium is 12. Therefore its necleus must contain
12 protons and no electrons
10.The farther an electron is from the nucleus, the more ______ it has
Energy
14.Which particles determine the atomic number of an element.
Protons only
- The maximum number of electrons that can occupy the second shell of an atom of magnesium.
8
22.An atom is electrically neutral because
the number of protons and electrons are equal
25.When looking at the halogens on the periodic table, how does the number of valence electrons change as the energy level is increased.
The total number of valence electrons does not change. It remains at 7
31.Which of the following elements would be the most reactive?
Iodine
32.Which of the following elements would be the least reactive.
Silicon. Packet pg. 16
37.Arranged the elements on the periodic table based on atomic number.
Henry Mosely. Packet pg. 4
40.Nuclear model; Gold Foil experiment allowed him to discover that the nucleus was the positively charged center of the atom surround by negatively charged electrons
Ernest Rutherford. Packet pg. 3
41.Arranged the elements on the periodic table based on atomic mass
Dmitri Mendeleev. Packet pg. 3
43.Electrons travel in fixed orbits around the nucleus of the atom.
Niels Bohr. Packet pg. 4
46.In each period, how does the number of electrons in each kind of atom change from left to right between groups 1 and 2? Explain how you know.
Atoms electrons increase by one, Atomic number increases by one
