Atoms and Elements (II) - Desklib

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

8. How many protons are there in silicon? Gold?
Silicon=14 protons
Gold =79 protons
9. Refer to a periodic table of the elements. Using a complete sentence,
describe how to find the number of protons for an element.
The number of protons of an element is equivalent to the atomic number
Z in the Periodic table (Scerri, 2011)
10.How many protons are there in potassium? Antimony? Add them to the table.
Potassium=19 protons
Antimony=51 protons
11.A certain element has eight protons. What element is it?
The element is oxygen

12.Which particle determines the identity of an element: electron, proton, or
neutron?Protons are the particles that determines the identity of an element (Levi &
Posenthal, 2012)
13.A mad scientist claims to have discovered a new form of carbon that
has seven protons. How would you respond?
An element with 7 protons is Nitrogen not carbon. All elements have
unique number of protons.
MODEL 2: WHICH ONES ARE THE METALS?