Download C2- Topic 1: Atomic structure and the periodic table. Assessable

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Transcript
C2- Topic 1: Atomic structure and the periodic table.
Assessable learning outcomes:

Explain how Mendeleev:
- arranged the elements, known at that time, in a periodic table by using
properties of these elements and their compounds
- used his table to predict the existence and properties of some elements not
then discovered

Classify elements as metals or non-metals according to their position in the
periodic table

Describe the structure of an atom as a nucleus containing protons and neutrons,
surrounded by electrons in shells (energy levels)

Demonstrate an understanding that the nucleus of an atom is very small compared
to the overall size of the atom

Describe atoms of a given element as having the same number of protons in the
nucleus and that this number is unique to that element

Recall the relative charge and relative mass of:
- a proton
- a neutron
- an electron

Demonstrate an understanding that atoms contain equal numbers of protons and
electrons

Explain the meaning of the terms:
- atomic number
- mass number
- relative atomic mass

Describe the arrangement of elements in the periodic table such that:
- elements are arranged in order of increasing atomic number, in rows called
periods
- elements with similar properties are placed in the same vertical column, called
groups

Demonstrate an understanding that the existence of isotopes results in some
relative atomic masses not being whole numbers

Calculate the relative atomic mass of an element from the relative masses and
abundances of its isotopes

Apply rules about the filling of electron shells (energy levels) to predict the
electronic configurations of the first 20 elements in the periodic table as diagrams
and in the form 2.8.1

Describe the connection between the number of outer electrons and the position of
an element in the periodic table