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Chapter 18—PROPERTIES OF ATOMS AND THE PERIODIC TABLE

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Presentation transcript:

$100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500 $100 $200 $300 $400 $500

The vertical columns on the periodic table of elements

What are groups?

Most reactive of all metals

What are Alkali Metals?

Arranged elements on a table by increasing atomic mass

Who is Mendeleev?

Horizontal rows on the periodic table of elements

What are periods?

Have characteristics of both metals and non- metals

What are metalloids?

Neutral particles found in the nucleus

What is a neutron?

What is an electron orbit?

Dense, positively charged part of an atom that contains protons and neutrons

What is the nucleus?

What is an electron?

Is equivalent to the number of electrons

What are protons?

8 Oxygen 16

What is the elements name?

Many of these elements are synthetic or man- made

What are Rare-Earth elements?

Can be calculated by adding the number of protons and neutrons

What is the mass number?

Has the least mass of all subatomic particles.

What is the electron?

We are currently studying chapter

What is 18?

Twentieth-century scientists believe electrons are found in regions called ______________.

What are electron clouds?

Hypothesized that electrons move around the nucleus in a fixed orbit at specific energy levels

Who is Neils Bohr?

Stated that matter is made up of small particles that he named atoms

Who is Democritus?

Stated that matter is made up of small particles that he named atoms

Who is Democritus?

In 1897 the British scientist J. J. Thomson discovered ________, the negatively charged particles in the atom.

What is the electron?

First scientist to provide evidence to support the atomic theory

Who is John Dalton?

One or two letters used to represent an elements name

What is chemical symbol?

Made of one kind of substance that can not be separated by physical means

What is an element?

The smallest particle that an element can be divided into and still have the properties of that element

What is an atom?

The Greek word meaning indivisible

What is atomos?

Atoms of the same element that have different number of neutrons

What are isotopes?

An atom of potassium with an atomic number of 19 and an atomic mass of 39.1 has ____ neutrons.

What is 20 neutrons?

Neutrons and ____ each have a mass of about 1 amu

What are protons?

Are solids at room temperature except for mercury

What are metals?

All characteristics are opposite of the metals and half are gases at room temperature

What are non-metals?

They look shiny and are good conductors of electricity and thermal energy

What are metals?

Draw mind map of the Periodic table and its components (hint foldable)