Name: Dr.Poulton____
Block: Ranelagh School
Chemistry
Atomic Structure
1.The 3 particles of the atom are:
a. proton_________________
b. neutron________________
c. electron________________
Their respective charges are:
a. +1e___________________
b. 0_____________________
c. -1e___________________
2.The number of protons in one atom of an element determines the atom’s
___________identity/type________, and the number of electrons determines the
___________charge________ of an ion/atom.
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
______________proportion/percentage_____ of each isotope.
5.The ______nucleon number_______________ 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 _______nucleons/neutrons____
in one atom of an element. In order to calculate the number of neutrons you must
subtract the ______proton number_______ from the __nucleon number__.
7.Give the symbol and number of protons in one atom of:
Lithium _____Li, 3______________
Bromine _____Br, 35____________
Iron ________Fe, 26_____________
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.Give the symbol and number of neutrons in one atom of:
(To get “mass number ”,you must round the “atomic mass ” to the nearest whole
number)) Show your calculations.
Barium:
Ba, N = A – Z = 137 – 56 = 81 Bismuth:
Carbon:
C, N = A – Z = 12 – 6 = 6
Fluorine: F, N = A – Z = 19 – 9 = 10
Bi, N = A – Z =_209 - 83 =126
Hydrogen: H, N = A – Z = 1 – 1 = 0
Magnesium: Mg, N = A – Z = 24 – 12 = 12
Europium: Eu, N = A – Z = 152 – 63 = 89 Mercury: Hg, N = A – Z = 201 – 80 = 121
10.Name the element which has the following numbers of particles:
a.26 electrons,29 neutrons,26 protons ___________________Iron_______
b.53 protons,74 neutrons _____________________________Iodine________
c.2 electrons (neutral atoms)___________________________Helium______
d.20 protons _______________________________________Calcium______
e.86 electrons,125 neutrons,82 protons (charged atom) _____Lead (4- ion)_____
f.0 neutrons _______________________________________Hydrogen_____
11 .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_____