Download Atoms and the periodic table

Atoms and the periodic table
1. What is the charge on a neutron?
2. What is the mass of an electron?
3. What is the positive particle in the
nucleus called?
Atomic Structure Revision
Atoms and the periodic table
1. What is the charge on a neutron?
0
2. What is the mass of an electron?
0 (only about 1/1840 of a proton’s mass)
3. What is the positive particle in the
nucleus called?
Proton
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Atoms and the periodic table
1. Add the correct
number of electrons to
this diagram.
2. Label all of the
fundamental particles
of an atom.
3. Which element does
this diagram
represent?
Atomic Structure Revision
Atoms and the periodic table
Electron
Proton
X
X
Neutron
1. Add the correct
number of electrons to
this diagram.
2. Label all of the
fundamental particles
of an atom.
3. Which element does
this diagram
represent?
He (helium)
Atomic Structure Revision
Atoms and the periodic table
Each 1…. has its own proton number (also
known as its 2…. number). This tells you the
number of 3…. in the nucleus, which is the
same as the number of 4…. in a 5…. atom.
The mass number tells you the number of
6…. and 7…. added together.
Atomic Structure Revision
Atoms and the periodic table
Each element has its own proton number
(also known as its atomic number). This
tells you the number of protons in the
nucleus, which is the same as the number of
electrons in a neutral atom.
The mass number tells you the number of
protons and neutrons added together.
Atomic Structure Revision
Atoms and the periodic table
How many electrons, protons and neutrons
do the following atoms have?
(atomic (proton) numbers: H = 1, He = 2,
Mg = 12, U = 92)
1H
4He
24Mg
238U
Atomic Structure Revision
Atoms and the periodic table
How many electrons, protons and neutrons
do the following atoms have?
(atomic (proton) numbers: H = 1, He = 2,
Mg = 12, U = 92)
1H
p = 1, n = 0, e = 1
4He
p = 2, n = 2, e = 2
24Mg p = 12, n = 12, e = 12
238U
p = 92, n = 146, e = 92
Atomic Structure Revision
Atoms and the periodic table
1.... are atoms with the same number of
2...., but a different number of neutrons.
Many 3.... have isotopes, for example,
chlorine has 4.... isotopes, chlorine-35 and
5.....
Isotopes have the 6.... chemical properties,
but 7.... physical properties.
Atomic Structure Revision
Atoms and the periodic table
Isotopes are atoms with the same number of
protons, but a different number of neutrons.
Many elements have isotopes, for example,
Chlorine has 2 isotopes, chlorine-35 and
chlorine-37.
Isotopes have the same chemical
properties, but different physical properties.
Atomic Structure Revision
Atoms and the periodic table
1. What is the definition of relative atomic
mass?
2. Why do some elements have a R.A.M
which is a decimal number?
3. What is the symbol for R.A.M.?
Atomic Structure Revision
Atoms and the periodic table
1. What is the definition of relative atomic mass?
The mass of an atom compared to 1 atom of 12C
2. Why do some elements have a R.A.M which is a
decimal number?
It takes into account the proportions of each
isotope
3. What is the symbol for R.A.M.?
Ar
Atomic Structure Revision
Atoms and the periodic table
1. Lead (atomic number 82) is in Group 4. How
many electrons are there in the outer shell of a
lead atom?
2. An iodine atom has 53 electrons. How many
electrons are there in an iodide ion, and what
charge does the ion carry?
Atomic Structure Revision
Atoms and the periodic table
1. Lead (atomic number 82) is in Group 4. How
many electrons are there in the outer shell of a
lead atom? 4
2. An iodine atom has 53 electrons. How many
electrons are there in an iodide ion, and what
charge does the ion carry?
54 electrons; 1 negative charge
Atomic Structure Revision
Atomic Structure Revision