Презентация, доклад химия пәнінен (8 сынып)

have the greater atomic radius?
Sort the elements in order of increasing metallic properties: Ca, Mg, Sr, Be, Ba
Why is the electronegativity value of most noble gases zero?
A nonmetal has a smaller ionic radius compared with a metal of the same period. Do you agree? Why?


Have you ever heard that metals have a memory?
Lesson plan:
1. Elements: “Metals”, “Nonmetal”, “Matelloids”
2. Physical and chemical properties
3. Science in context, facts and terminology
4. Activity

(except mercury)

Metals are HARD.
(except Lithium, Potassium, Sodium)

LUSTER – the way an object’s surface reflects light

and gold are good electrical conductors. In a conductor, electric current can flow freely. Since metals have free electrons, they can carry a charge easily.

Copper Wiring

metals ability to be shaped or formed as by hammering or pressure; can be beaten into thin sheets

Aluminum is malleable.

can be drawn into a wire

Solids – Carbon, Sulfur, Phosphorus
Liquid – Bromine
Gases – Oxygen, Hydrogen, Nitrogen

shiny!)

Example: Phosphorus

electricity or heat well.

The atoms in nonmetals do not have loose electrons. Therefore, when electricity, or something hot touches a non-metal, the energy does not move quickly through the material.

Sulfur

non-metals.
Some are shiny, some are dull, they are somewhat malleable and ductile, and can conduct heat and electricity at a lesser level than metals.

BORON

SILICON

ARSENIC

computers, telephones, etc.)

They are useful because they conduct just the right amount of electricity or heat.

Find the place of Y in the Periodic Table.
-Find the numbers of valence electrons fo the elements magnesium (12Mg), oxygen (8O), silicon (14Si) and zink (30Zn)
-The atomic mass number of X is 70, and the number of neutrons of X is 39. What are the group and period numbers of element X in the Periodic Table?
-An Z2- ion has 18 electrons. What are the group and period number of the Z atom in the Periodic Table?

protons in the nucleus.
How many s electrons does it have in total?
How many electrons does it have in 4p orbitals?
Which type of orbital has the more electron than other?