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Kelapa Gading

The document is a chemistry worksheet that introduces students to the structure of atoms. It defines key atomic terms like element symbol, mass number, and atomic number. It then shows a table that lists several elements and their corresponding number of protons, neutrons, and electrons, which can be calculated based on the mass number and atomic number. The table is used to demonstrate how to determine the subatomic particle makeup of different elements.

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Utari Ika Cahyani
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118 views2 pages

Kelapa Gading

The document is a chemistry worksheet that introduces students to the structure of atoms. It defines key atomic terms like element symbol, mass number, and atomic number. It then shows a table that lists several elements and their corresponding number of protons, neutrons, and electrons, which can be calculated based on the mass number and atomic number. The table is used to demonstrate how to determine the subatomic particle makeup of different elements.

Uploaded by

Utari Ika Cahyani
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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SECONDARY 3-CHEMISTRY

Semester 1, Term 1 (2018-2019)


Kelapa Gading Worksheet

Name :__________________________________
Class :_________________
Chapter 2: The Nature of Matter
“Structure of Atom”

X = An Element
A = Mass Number
Z = Atomic Number
# Proton = Atomic Number (Z)
# Electron = Atomic Number (Z) = # Proton
# Neutron = Mass Number – Atomic Number (A – Z)

Calculating the number of each particle in an element.

Element Mass Atomic


Proton Neutron Electron
Symbol Number Number

B 11 5 5 6 5

N 14 7

S 16 16

Cl 18 17

K 39 19

Mg 24 12

Ca 20 20

Co 32 27

Ar 40 18

I 127 53

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