The Periodic Table

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Mendeleev and the Modern Periodic Table

Dmitri Mendeleev arranged elements into what we now know as the modern periodic table.

Mendeleev

Dmitri Mendeleev was a Russian scientist.
He was born in 1834 and died in 1907.
As a very young man, it was clear he had the potential to go on to greatness.
At the age of 16, his mother took him to Moscow to enrol in university. They wouldn't accept him so he later enrolled at the university in St. Petersberg.

The Periodic Table

In 1869, Mendeleev had knowledge of the 60 known elements.
He placed them in order of their atomic mass and their properties in what we now know as the periodic table.
He even left gaps and predicted the properties of the missing elements!

The Periodic Table of Elements

The periodic table of elements is a system of arranging the elements. All the elements found in the periodic table are elements that could be found on any planet in the whole universe.

The Elements

There are 118 elements on the periodic table.
90 of these occur naturally.
The rest are produced by man.
The elements are arranged by their increasing atomic number.
Metals can be found on the left-hand side (of the dividing step line).
Non-metals are found on the right-hand side (of the dividing step line).

Groups

The vertical columns of the periodic table are called groups.
Elements in each group can be named:
- Group 1: the alkali metals.
- Group 7: the halogens.
- Group 0: the noble gases.
The large block in the middle is called the transition metals.

Properties of groups

Elements in each group have similar properties and patterns to each other. For instance:
- Group 1, the alkali metals, are very reactive. They get more reactive as they go down the group.
- Group 7, the halogens, are also reactive. They get less reactive as they go down the group.

Periods

The horizontal rows of the periodic table are called periods.
Patterns can also be seen as you go along the periods.
The size of the atom decreases as you go from left to right along the period.
The elements get less metallic as you go from left to right.

1Biology

1.1Cells, Tissues & Organs

1.2Reproduction & Variation

1.2.1Reproduction in Humans

1.2.2Male Reproductive System

1.2.3Female Reproductive System

1.2.4Gestation

1.2.5Pregnancy

1.2.6Puberty

1.2.7The Menstrual Cycle

1.2.8Reproduction in Plants

1.2.9Pollination

1.2.10Dispersal Method

1.2.11Variation

1.2.12Causes of Variation

1.2.13Inheritance

1.2.14Adaptations and Evolution

1.2.15Species & Selective Breeding

1.2.16Genetic Conditions

1.2.17End of Topic Test - Reproduction & Variation

1.3Ecological Relationships & Classification

1.4Digestion & Nutrition

1.4.1Balanced Diets

1.4.2Vitamins & Minerals

1.4.3Protein

1.4.4Lipids, Oils and Fats

1.4.5Carbohydrates

1.4.6Starch

1.4.7Energy Needs

1.4.8Dietary Fibre

1.4.9Diseases Caused by Nutritional Deficiencies

1.4.10Digestion

1.4.11Plant Nutrition

1.4.12Enzymes in Digestion

1.4.13Required Practical - Enzymes in Digestion

1.5Plants & Photosynthesis

1.5.1Roots

1.5.2Photosynthesis

1.5.3Leaves

1.5.4Rate of Photosynthesis

1.5.5Testing the Rate of Photosynthesis

1.5.6Water Transport in Plants

1.5.7Translocation

1.5.8The Carbon Cycle

1.5.9Human Activities & Carbon Dioxide

1.6Biological Systems & Processes

2Chemistry

2.1Particles

2.1.1Particles

2.1.2States of Matter

2.1.3Changes of State

2.1.4Properties of States of Matter

2.1.5Diffusion

2.1.6Changing State

2.1.7Pressure

2.1.8Temperature Increase in a Gas

2.1.9Conservation of Mass

2.1.10Purity of Substances

2.1.11Pure Substances

2.1.12Evaporation

2.1.13Mixtures

2.1.14Separating Mixtures

2.1.15Distillation

2.1.16Chromatography

2.1.17Solubility

2.1.18Investigating Solubility

2.2Chemical Reactions

2.2.1Chemical Reactions

2.2.2Common Reactions

2.2.3Acids & Alkalis

2.2.4Reactions of Acids

2.2.5Testing for Hydrogen

2.2.6The pH Scale

2.2.7Titration

2.2.8End of Topic Test - Chemical Reactions

2.3Atoms, Elements, Compounds

2.3.1Atoms

2.3.2Elements

2.3.3Compounds & Mixtures

2.3.4Electron Configuration

2.3.5Chemical Symbols

2.3.6Chemical Formulae

2.3.7Conservation of Mass

2.3.8Vacuums

2.3.9Molecules

2.3.10End of Topic Test - Particles & Atoms

2.4The Periodic Table

2.4.1Physical Properties

2.4.2Chemical Properties

2.4.3The Periodic Table

2.4.4Metals

2.4.5Non-Metals

2.4.6Alkali Metals

2.4.7Halogens

2.4.8Oxides

2.4.9End of Topic Test - The Periodic Table

2.5Materials & the Earth

2.6Reactivity

2.6.1Ions

2.6.2Ionic Bonding

2.6.3State Symbols

2.6.4Balancing Chemical Equations

2.6.5Relative Formula Mass

2.6.6Calculating the Relative Formula Mass

2.6.7The Reactivity Series

2.6.8Carbon & The Reactivity Series

2.6.9Displacement Reactions

2.6.10Displacement Reactions - Halogens

2.6.11Alloys

2.6.12Metal Alloys

2.7Energetics

2.7.1Measuring Gas Production

2.7.2Observing a Colour Change

2.7.3Analysing Reaction Rates

2.7.4Factors Affecting the Rate of Reaction

2.7.5Catalysts

2.7.6Testing for Oxygen

2.7.7Energy Changes During Reactions

2.8Properties of Materials

2.8.1Testing for Gases

2.8.2Alloys

2.8.3Density

2.8.4Density of Solids, Liquids & Gases HyperLearning

3Physics

3.1Energy

3.2Forces & Motion

3.3Waves

3.4Electricity & Magnetism

3.4.1Circuit Symbols

3.4.2Resistors & Diodes

3.4.3Electric Current

3.4.4Measuring Current

3.4.5Potential Difference

3.4.6Series Circuits

3.4.7Parallel Circuits

3.4.8Resistance

3.4.9Charges

3.4.10Static Electricity

3.4.11Magnets

3.4.12Magnetic Fields

3.4.13The Earth's Field

3.4.14Electromagnetism

3.4.15Uses of Electromagnets

3.4.16Strength of Magnetic Fields

3.4.17Circuit Symbols HyperLearning

3.5Matter

3.6Space Physics

3.6.1The Sun

3.6.2The Planets

3.6.3Other Astronomical Bodies

3.6.4The Milky Way

3.6.5Beyond The Milky Way

3.6.6The Seasons

3.6.7Days, Months & Years

3.6.8The Moon

3.6.9Light Years

3.6.10End of Topic Test - Space

4Thinking Scientifically

4.1Models & Representations

4.1.1Strengths & Limitations of Models

4.1.2Symbols & Formulae to Represent Scientific Ideas

4.1.3Analogies in Science

4.1.4Changing Models – Atomic Theory

4.1.5Working Safely in the Lab

4.1.6Variables

4.1.7Writing a Hypothesis & Prediction

4.1.8Planning an Experiment

4.1.9Maths Skills for Science

4.1.10Drawing Scientific Apparatus

4.1.11Observation & Measurement Skills

4.1.12Types of Data

4.1.13Graphs & Charts

4.1.14Bias in Science

4.1.15Conclude & Evaluate

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