Question

atomic structure & isotope worksheet

1. the mass of an atom is contained mainly in its ___ and ___.
2. the identity of an element is determined by its number of _____.
3. isotopes are atoms with the same number of _____ and different number of neutrons
4. the charge of an atom or ion is determined by its number of _____.
5. what is the central core of an atom called?

a) electron b) isotope c) nucleus d) proton

1. an atom with a charge is known as an

a) isotope b) isomer c) element d) ion

1. an atom with equal number of protons and electrons is called

a) isotope b) neutral atom c) ion d) nucleus

1. isotopes have

a) same number of neutrons b) different number of neutrons
c) different number protons d) different number of electrons

1. an isotope of carbon is

a) boron - 12 b) nitrogen - 12 c) carbon - 14 d) hydrogen - 2

1. the table below contains information about several elements. in each case, enough information has been provided for you to fill in the blanks.

protons	neutrons	electrons	element name	is it an ion? if so, what is the charge?	nuclear symbol
47	63	47
15	17	15
12	12	12
12	13	12
28	32	27

Explanation:

1. Protons and neutrons are in the nucleus and have significant mass.
2. The number of protons defines an element.
3. Isotopes have the same number of protons but different neutrons.
4. The charge is determined by the difference between protons and electrons.
5. The central core is the nucleus.
6. A charged atom is an ion.
7. Equal protons and electrons make a neutral atom.
8. Isotopes have different neutron numbers.
9. Carbon - 14 is a carbon isotope.
10. Use proton number to identify element, compare protons and electrons for charge, and write nuclear symbol with mass number and atomic number.

Answer:

1. protons; neutrons
2. protons
3. protons
4. protons and electrons
5. c) nucleus
6. d) ion
7. b) neutral atom
8. b) different number of neutrons
9. c) carbon - 14

10.

Protons	Neutrons	Electrons	Element name	Is it an ION? If so, what is the charge?	Nuclear symbol
15	17	15	Phosphorus (P)	No	$^{32}_{15}$P
12	12	12	Magnesium (Mg)	No	$^{24}_{12}$Mg
12	13	12	Magnesium (Mg)	No	$^{25}_{12}$Mg
28	32	27	Nickel (Ni)	Yes, + 1	$^{60}_{28}$Ni$^{+}$