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Periodic Table
Periodic Trends
Element Identification
Element Identification 2
Atomic Theory
100
What number tells you the number of protons and electrons?
Atomic Number
100

What is the 'brain' of the atom?

Nucleus

100

What is the name of element number 1?

Hydrogen

100

What element has the symbol Xe?

Xenon

100

What characteristics did Dalton attribute to atoms?

Smooth hard balls that could not be broken into smaller pieces.

200
How do you figure out the number of neutrons?
Subtract the atomic number from the atomic mass
200

What particle has a positive charge?

Proton

200

What element has an atomic mass of 238.

U, Uranium

200

What element has 17 electrons?

Chlorine

200

What did Thomson discover about atoms?

They contain negatively charged particles containing electrons.

300
How do you find an element's atomic mass?
Add the number of neutrons and the number of protons together
300

What particle has no charge?

Neutron

300

What is the name of the element with the elemental symbol Zr?

Zirconium

300

What element has 157 neutrons & is named after a scientist (creator of the world's first nuclear reactor)?

Fm, Fermium

300

What were the results of Rutherford's experiment?

He felt that an atom was mostly empty space but has a positive charge at its center.

400
How many liquids are on the periodic table?
2
400

What particle has a negative charge?

Electron

400

Which element has 42 as its atomic number?

Mo, Molybdenum

400

What element is a gas with 22 neutrons?

Argon

400

How did Bohr revise the atomic model?

Suggested that electrons are found only in specific orbits around the nucleus.

500
What does the term 'valence electrons' mean? (2 things)
number of electrons on outermost shell, tells how reactive an element is
500

What  particle is not inside the nucleus?

Electrons

500

What element has the elemental symbol Yb?

Ytterbium

500

What element is a sold named after a planet with 144 neutrons?

Np, Neptumium

500

What is the cloud model theory?

Electrons move rapidly within a a cloudlike region around the nucleus.