Question

exit ticket questions for nearpod:

1. what is an ion?

a) an atom that has gained or lost electrons.
b) an atom with a full outer electron shell
c) a molecule made of two or more atoms
d) a type of bond between two atoms

1. which of the following represents a cation?

a) na+
b) cl-
c) br-
d) o2-

1. what do lewis dot structures represent?

a) the mass of an atom
b) the arrangement of atoms in a molecule
c) the valence electrons of an atom
d) the energy levels of an atom

1. how many valence electrons does carbon (c) have, and how would it be represented in a lewis dot structure?

a) 2 electrons, represented by two dots
b) 4 electrons represented by four dots around the symbol
c) 6 electrons, represented by six dots
d) 8 electrons, represented by eight dots

1. the atoms of which element will gain electrons to form an ion?

a) mercury
b) bromine
c) beryllium
d) potassium

1. the atoms of which element will form cations?

a) selenium
b) neon
c) copper
d) iodine

1. which combination of elements will form an ionic bond?

a) oxygen and fluorine
b) nitrogen and helium
c) sodium and calcium
d) potassium and chlorine

1. which is the correct lewis dot structure for silicon?

Explanation:

1. An ion is defined as an atom that has gained or lost electrons. Option a is correct.
2. Cations are positively charged ions. Na+ is a cation. Option a is correct.
3. Lewis dot structures represent valence electrons. Option c is correct.
4. Carbon has 4 valence electrons, shown as four dots. Option b is correct.
5. Non - metals like Bromine gain electrons. Option b is correct.
6. Metals like Copper form cations. Option c is correct.
7. Ionic bonds form between metals (Potassium) and non - metals (Chlorine). Option d is correct.
8. Silicon has 4 valence electrons. Structure A (with four single dots around Si) is correct.

Answer:

1. a. An atom that has gained or lost electrons
2. a. Na+
3. c. The valence electrons of an atom
4. b. 4 electrons represented by four dots around the symbol
5. b. Bromine
6. c. Copper
7. d. Potassium and Chlorine
8. A