Starting small
Part 1
In the space below draw the atom from the description given below.. Put in the labels
for: proton, neutron, electron, orbit and nucleus.
The atom has 5 protons and 6 neutrons in the central nucleus. The 5
electrons are in two orbits
(two in the inner orbit, three in the outer orbit).
Part 2
Complete the sentences below.
The central part of an atom (the ______________) is where the ______________ of an
atom is concentrated because it contains the two heavier particles called
______________ and
______________. The positively charged particle is the ______________ and the
______________ has no charge . Electrons move around the central part in
______________ and have a _____________ charge. Atoms are neutral because
there are as many protons as _____________
[proton, electrons, positive, mass, neutron, shells/orbits, nucleus, negative]
Part 3
A student writes “The number of electrons in an uncharged atom is the same as the
number of neutrons.” Why is this wrong? What should the student have written?
The number of electrons in an uncharged atom is the same as the number of ________________ . The mass of
electrons in an atom is negligible (ie can be ignored.
(choose one from Electron, Proton, Nucleus)
Part 4
Complete the table below by putting in the missing numbers.
Atom
Atomic
number
Mass
number
X
24
52
Y
Z
20
Number of
protons
Number of
neutrons
12
14
Number of
electrons
8