ATOMS AND ELEMENTS (II)CHEMACTIVITY 4B
MODEL 1: WHAT DEFINES AN ELEMENT?
Element Symbol
Number of
Protons
silicon Si 14
phosphorus P 15
potassium K 19
gold Au 79
Antimony Sb 51
CRITICAL THINKING QUESTIONS
1. Write the symbol for the element silicon.
Si
2. Write the symbol for the element phosphorus.
P
3. Write the symbols for the element potassium.
K
4. Describe the relationship between the name of an element and its symbol.
Chemical symbols of some elements such as phosphorus and nitrogen are
the first symbol of their names. For some elements, it the first two letters of
their names with the first one being capital and the second being small letter
such as silicon. For elements with Latin names such as potassium and silver,
the chemical symbols are derived from Latin names in a similar manner
(Zumdahl & DeCoste, 2010)
.
5. When the name of an element is written in a sentence, is it capitalized? How
do you know?
When a name of element is written in full in a sentence, it should not be
capitalized. This is known from the fact in this case, name of elements simply
forms a part of the system.
6. Describe the proper use of capitalization for element symbols.
For elements with a single letter as a chemical symbol, the letter is always
capitalized. For elements with two letters forming the chemical symbol, only
the first letter is capitalized (West, 2013)
.
7. Refer to a periodic table of the elements. What is the name of the element
with the symbol Sb? Add it to the table.
Antimony

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