10. one of the first models of the atom was proposed by niels bohr. in his model, electrons existed in basic energy levels called * a. rows b. orbits c. families d. orbitals 11. what does the principal quantum number indicate about a given electron? * a. the shape of the electron cloud. b. the direction the electron is spinning. c. the speed of the electron. d. he general energy level of the electron. 12. when an electron drops down from an excited state to its ground state, the electron * a. doubles its energy b. moves away from the nucleus c. gives off energy in the form of light d. absorbs additional quantas of energy

10. One of the first models of the atom was proposed by Niels Bohr. In his model, electrons existed in basic energy levels called *

A. rows

B. orbits

C. families  True

D. orbitals

11. What does the principal quantum number indicate about a given electron? *

A. The shape of the electron cloud.  True

B. The direction the electron is spinning.

C. The speed of the electron.

D. he general energy level of the electron.

12. When an electron drops down from an excited state to its ground state, the electron *

A. Doubles its energy

B. Moves away from the nucleus

C. Gives off energy in the form of light  True

D. Absorbs additional quantas of energy

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.