Download Atomic Structure

Atomic Structure
1. The 3 particles of the atom are:
a.______________________
b.______________________
c.______________________
Their respective charges are:
a.______________________
b.______________________
c.______________________
2. The number of protons in one atom of an element determines the atom’s____________.
3. The atomic number tells you the number of ______________________in one atom of an element. It
also tells you the number of _____________________in a neutral atom of that element. The atomic
number gives the “identity “ of an element as well as its location on the Periodic Table. No two
different elements will have the _____________ atomic number.
4. The ______________________of an element is the average mass of an element’s naturally
occurring atom, or isotopes, taking into account the ______________________of each isotope.
5. The ______________________of an element is the total number of protons and neutrons in
the______________________ of the atom.
6. The mass number is used to calculate the number of ______________________in one atom of an
element. In order to calculate the number of neutrons you must subtract the
___________________from the ______________________.
7. Give the symbol and number of protons in one atom of:
Lithium __________________
Iron __________________
Bromine __________________
Copper __________________
Oxygen __________________ Mercury __________________
Krypton __________________Helium _____________________
8. Give the symbol and number of electrons in a neutral atom of:
Uranium __________________ Chlorine __________________
Boron __________________
Iodine __________________
Antimony __________________Xenon __________________
9. Name the element which has the following numbers of particles:
a. 26 electrons, 29 neutrons, 26 protons _____________________
b. 53 protons, 74 neutrons _____________________
c. 2 electrons (neutral atoms)_____________________
d. 20 protons _____________________
10. If you know only the following information can you always determine what the element is?
(Yes/No).
a. number of protons ___________
b. number of neutrons___________
c. number of electrons in a neutral atom___________
d. number of electrons___________
Atomic Structure KEY
1. The 3 particles of the atom are:
a. ____Protons__________________
b._____ Electrons_______________
c._____ Neutrons________________
Their respective charges are:
a._______ Positive_____________
b.______ Negative _____________
c.____ None __________________
2. The number of protons in one atom of an element determines the atom’s__ atomic number__.
3. The atomic number tells you the number of ____ protons _____in one atom of an element. It also
tells you the number of ____ electrons __________in a neutral atom of that element. The atomic
number gives the “identity “ of an element as well as its location on the Periodic Table. No two
different elements will have the ____same______ atomic number.
4. The ___Atomic mass ____of an element is the average mass of an element’s naturally occurring
atom, or isotopes, taking into account the __ abundance _______of each isotope.
5. The __ atomic mass _________of an element is the total number of protons and neutrons in the
nucleus of the atom.
6. The mass number is used to calculate the number of ____ neutrons ____in one atom of an element.
In order to calculate the number of neutrons you must subtract the ___ atomic number _from the
___ mass number __.
7. Give the symbol and number of protons in one atom of:
Lithium __ Li______ 3 __________
Iron ____ Fe _______ 26 _______
Bromine ____Br ___ 35 __________
Copper __ Cu _______ 29 _________
Oxygen ___ O _______ 8 ________ Mercury ___ Hg _____ 80 __________
Krypton ___ Kr _____ 36 __________Helium ____ He _______ 2 __________
8. Give the symbol and number of electrons in a neutral atom of:
Uranium ___ U ____ 92 ___________ Chlorine ____ Cl _____ 17 _________
Boron ___ B ____ 5 ___________
Iodine ___ I _____ 53 __________
Antimony __Sb _____ 51 ___________Xenon __Xe ______ 54 __________
9. Name the element which has the following numbers of particles:
a. 26 electrons, 29 neutrons, 26 protons _____Iron-55 or 55Fe
b. 53 protons, 74 neutrons ___ Iodine- 127 or 127I___
c. 2 electrons (neutral atoms) ______ He _______________
d. 20 protons ___ Ca __________________
10. If you know only the following information can you always determine what the element is?
(Yes/No).
a. number of protons ___ yes________
b. number of neutrons____ no_______
c. number of electrons in a neutral atom_____ yes______
d. number of electrons__ no_________