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Transcript of Atomic Structure
: is equal to the sum of the protons and neutrons in the nucleus of an atom.
This number is expressed as a whole #
# Neutrons = Mass # - Atomic #
Atoms By Number
Like charges repel, opposite charges attract.
Opposes the electromagnetic force between protons in the nucleus.
The strongest of the four forces, but only acts over short distances.
The force responsible for radioactive decay.
The force of attraction between all objects in the universe.
The weakest of the four forces.
Forces in Atoms
the positively charged center of the atom
positive charged particle with a relative mass of 1
neutrally charged particle in the nucleus with a relative mass of 1
: negatively charged, mostly empty space
negatively charged particles with a relative mass of 1 / 1840
Basic Parts of the Atom
15. 09/24/13 Atomic Structure 22
Date Lecture/Lab/Activity Pg#
Table of Contents
I will distinguish between atomic number, mass of an atom and average atomic mass by describing the structure of an atom and drawing a simple atomic model using information extracted from the periodic table.
Atoms by Number - Explore
Structure of the Atom – Lecture
Nuclear Symbol for elements
Parts of the Atom
1. Here is a simple atomic model of the beryllium atom. Draw and label the electrons, protons, and neutrons.
2. The total charge on each atom is zero. Explain why.
3. Why do you think the mass of the carbon atom shown is 12 atomic mass units (amu)
Use your periodic table to identify these elements
A. atomic number is 18
B. An element that has three electrons when atoms are neutral
C. Atomic mass is 16.0
1. Compare the two models. List three similarities and three differences.
2. Based on the models, why do you think helium is number 2 and beryllium number 4 on the periodic table.