Question

q1 chemistry: u2l8 mastery quiz 1 practice
do now:
use the data table below to answer questions 1 - 4. hint: create another row for charge and mass number.

atom	a	b	c	d
protons	7	11	7	11
neutrons	10	10	11	11
electrons	7	11	7	10

1. **which atoms has a neutral charge? select all that apply

(a) atom a (b) atom b (c) atom c (d) atom d

1. **which atoms has a net positive charge? select all that apply

(a) atom a (b) atom b (c) atom c (d) atom d

1. *select the identity of atom c

(a) nitrogen - 7
(b) nitrogen - 18
(c) sodium - 11
(d) sodium - 21

1. **examine the atomic symbol for carbon below. annotate the symbol with what each number stands for and calculate....

(a) atomic number = __________
(b) mass number = __________
(c) number of neutrons = __________
12 6 c

Explanation:

Step1: Determine neutral - charged atoms

A neutral atom has equal number of protons and electrons. Atom A has 7 protons and 7 electrons, Atom B has 11 protons and 11 electrons. So Atom A and Atom B are neutral.

Step2: Determine positively - charged atoms

A positively - charged atom has more protons than electrons. Atom D has 11 protons and 10 electrons, so it has a net positive charge.

Step3: Identify Atom C

The atomic number is the number of protons. Atom C has 7 protons, so it is nitrogen. The mass number is the sum of protons and neutrons, \(7 + 11=18\), so it is Nitrogen - 18.

Step4: Analyze carbon symbol

The bottom number in the atomic symbol \(^{12}_{6}C\) is the atomic number, which is 6. The top number is the mass number, which is 12. The number of neutrons is mass number - atomic number, \(12−6 = 6\).

Answer:

1. A. Atom A, B. Atom B
2. D. Atom D
3. B. Nitrogen - 18
4. (A) Atomic number = 6

(B) Mass number = 12
(C) Number of neutrons = 6