atoms

37

Atoms

Upload: asad-parkar

Post on 16-Jul-2015

193 views

Category:

Education

0 download

Report

Download

Tags:

Embed Size (px):

TRANSCRIPT

Atoms

This is a diagram of a CD. The diameter of its hole is one-eighth of the diameter of the CD.

Diagrams of atoms look very similar.

But the nucleus at the centre of an atom is very much smaller.

The diameter of the nucleus is around 100 000 times less than the diameter of the atom.

This is equivalent to a CD with a normal-sized hole and an overall diameter of 1.5 km.

Each atom has a nucleus at its centre, containing sub-atomic particles called protons and neutrons.

Sub-atomic particles called electrons are arranged around the nucleus.

What are the properties of these sub-atomic particles?

Their masses are incredibly small.

The proton and electron have incredibly small electric charges and the neutron has no charge.

To make sense of the tiny masses, we use relative masses. The proton’s relative mass is 1.

The electron is nearly 2000 times lighter than the proton and neutron.

To make sense of the tiny charges, we use relative charges. The proton’s relative charge is +1.

Protons and electrons have equal but opposite charges.

The nuclear symbol for lithium is Li.73

The bottom number is the atomic number or proton number, Z.

The top number is the mass number, A.

These numbers mean that this atom has 3 protons, and ...

… the number of protons added to the number of neutrons is 7.

So there are 7 − 3 = 4 neutrons.

There are an equal number of protons and electrons in an atom, so there are 3 electrons.

2

43

The three protons are found in the nucleus.

The four neutrons are also found in the nucleus.

The three electrons are arranged around the nucleus.

Cl is an isotope of chlorine. It is often called chlorine-35.35 17

Its mass number is 35.

Its atomic number is 17.

So there are 35 − 17 = 18 neutrons.

Cl is another isotope of chlorine. It is often called chlorine-37.3717

Its mass number is 37.

Its atomic number is 17.

So there are 37 − 17 = 20 neutrons.

Both isotopes have 17 protons and 17 electrons but different numbers of neutrons.

Isotopes of an element are chemically identical but have different physical properties.

Atoms structure

Atoms Atoms smallest particle that an element can be divided into. Atoms comes from the Greek word atomos which means “invincible.” Atoms are made

atoms. Bonds - Amphitheater Public Schools€¦ · An atom’s structure affects ... atoms. SECTION 1 Why do atoms combine? Main Idea When atoms combine, they become more stable

Atoms are building blocks of elements Similar atoms in each element Different from atoms of other elements Two or more different atoms bond in simple

ATOMS AND MOLECULES - Educasiaeducasia.org/.../Atoms-and-Molecules-Teachers-book.pdf · 2 An outline of this lesson How Atoms Change Molecular bonds hold atoms together in molecules;

Atoms, Elements. Atoms Protons Neutrons Electrons Contain 3 particles

Biochemistry Matter & Elements All matter made of elements (atoms)All matter made of elements (atoms) All atoms have structureAll atoms have structure

Atoms, Atoms Everywhere! Atoms, Atoms Everywhere! The History of Atomic Models

Atoms, Molecules and Ions Atoms, Molecules and Ions

Simply atoms atoms simply

Chapter 2: Atoms, Molecules & Life - Western Oregon …guralnl/gural/102Chapter 02 - Chemistry.pdfChapter 2: Atoms, Molecules & Life Inert Atoms = Atoms with their outermost shell

Obserwacja BEC - fuw.edu.plwwasil/WdOiFMS6.pdf · Logrithmic Evaporative Cooling N=4. x atoms atoms 0-023 atoms 1.24. osec N=9.6XIOA6 atoms 0-183 Na3 8x10" atoms 0-0.013 atoms

Chapter 2 Atoms and Elements...atoms of other elements. 3. Atoms combine in simple, whole-number ratios to form compounds. 4. Atoms of one element cannot change into atoms of another

PY3P05 Lectures 10-11: Multi-electron atoms oSchrödinger equation for oTwo-electron atoms. oMulti-electron atoms. oHelium-like atoms. oSinglet and triplet

Atoms, Molecules, and Ions Chapter 2 Atoms, Molecules, Ions

Chapter 4 Atoms and Elements 2 Experiencing Atoms atoms are incredibly small, yet they compose everything atoms are the pieces of elements properties

Atoms and Molecules - Educasiaeducasia.org/.../Atoms-and-Molecules-Students-book.pdf · 4 When atoms come together to make molecules, atoms cannot be destroyed and they cannot be

Atoms. Matter Elements Atoms Atoms are the building blocks of matter!

Electronic Structure of Atoms Electronic Structure of Atoms

Chapter 2 - asc.ohio-state.edu€¦ · Atoms, Molecules and Ions I) Atoms A) Dalton’s Atomic Theory 1) Elements composed of minute, indivisible particles called, Atoms 2) Atoms

Atoms combining

Introduction to Matter Matter & Measurements · Small units of matter: atoms, compounds & molecules Atoms – Atoms are the smallest particles within matter – Atoms are made up

Atoms and Elements: Are they Related? Fall 2011. ATOMS ALL MATTER IS MADE OF ALL MATTER IS MADE OF ATOMS Definition: ATOMS ARE THE Definition: ATOMS ARE

Atoms, Molecules, and Ions Dalton’s Atomic Theory 1) Elements are made up of atoms 2) Atoms of each element are identical. Atoms of different elements

1 Atoms, Molecules and Ions. 2 Atoms Each element composed of atoms All atoms of a given element are identical Atoms of an element are not

1 Elements and 1 Elements and Atoms Atoms

Atoms and Subatomic Particles - todhigh.comtodhigh.com/.../uploads/2018/03/Atoms-and-Subatomic-Particles.pdf · What particles are atoms made of? protons neutrons electrons Atoms

Atoms & Molecules

Atoms and Elements - mrstorie - Homemrstorie.wikispaces.com/file/view/Atoms and Elements... · · 2015-05-26mrstorie.wikispaces.com 10F Science Atoms and Elements 2 Unit A – Atoms

Atoms, Molecules, and Life Atoms - Ventura Collegeacademic.venturacollege.edu/sflagan/protected/Ch2_Water.pdf · Atoms, Molecules, and Life The Importance of Water Chapter 2 Atoms

Chapter 2 Atoms, Molecules, & Ions. Atomic Theory Elements composed of atoms Atoms can’t be changed Compounds of multiple atoms John Dalton

Nuclear Techniques Atoms for Peace for Global Development · Atoms for Peace Atoms for Peace Nuclear Techniques ... normally have a duration of 3 to 5 years. Atoms for Peace Atoms