physical science chapters 17&19

The atomic number of Re is 75. The atomic mass of one of its isotopes is 186. How many neutrons are in an atom of this isotope?

111

which is a term for a pattern that repeats

periodic

___________ is a shiny element that conducts, electricity and heat

Magnesium

______________ is an element that would have similar properties to those of neon

Argon

___________ is the state at which nitrogen is found at room temperature

Gas

____________ describes boron

Metalloid

The halogens are located in which group

17

how many outer level electrons do lithium and potassium have

1

__________ is not found in the nucleus of an atom

Electron

In which state of matter are most of the elements to the left of the stair step line in the periodic table

solid

In the current model of the atom, the electrons are located in the

electron cloud

Mendeleev created an organized table of elements called the

periodic table

The _______________ is the sum of the number of protons and neutrons in an atom

mass number

Two elements with the same number of protons, but a different number of neutrons are called

isotopes

A ________________ is a horizontal row in the periodic table

Period

______________ is the weighted average mass of all known isotopes for an element?

average atomic mass

The positively charged center of an atom is called the

nucleus

The particles that make up protons and neutrons are called

quarks

What element is formed when neptunium disintegrates

Plutonium

Which set of elements makes up the most reactive group of all metals?

alkali metals

Which elements are least reactive

noble gases

Which element is the most reactive of all nonmetals?

Fluorine

Which element is always found in nature combined with other elements

Magnesium

When magnesium and fluorine react, what type of bond is formed?

ionic

Because electrons move freely and metals which property describes metals

conductors

What type of bond is found in a piece of pure gold

metallic

The _________ are in Group 3 through 12 on the periodic table.

Transition metals

The _________ are located to the left of the stairs step line on the periodic table

Metals

A _________ is a molecule comprised of two atoms

Diatomic molecules

Different structural forms of the same element are called

allotropes

Positively charged giants are surrounded by freely, moving electrons in

Metallic bonding

_________ a student of Niels Bohr who discovered neutrons in the nucleus

Chadwick

__________ one of six very small particles that make up protons and neutrons

Quark

__________ scientist who propose the idea of a nucleus

Rutherford

__________ the smallest piece of matter that keeps the properties of the element to which it belongs

Atom

_____________ scientist to proposed one of the first models of the atom

Dalton

__________ the place where Bohr thought electrons would be found

Orbits

___________ scientist, who discovered that atoms contained electric charge

Thompson

_____________ the area where modern scientists think electrons are likely to be found

Electron cloud

__________ Greek philosopher, whose idea about matter was not quite so right, but everyone believed him for a couple thousand years

Aristotle

____________ Greek philosopher, who had the right idea about atoms

Democritus

__________ a device used to cause high speed collisions (without seatbelts!)

Particle accelerator

____________ advice to help scientist study tracks left by subatomic particles

Bubble chamber

In the modern periodic table elements are listed by increasing ____________. Each box represents an __________. A box contains the name, atomic number, _________, and______________ for the element. Vertical columns in the table are called ______________. Most elements in a column have the same number of _____________ in the outer energy level and tend to have similar____________.

Atomic number, element, chemical symbol, average atomic mass, groups, electrons, properties

Horizontal rose in the table are called ___________. The elements on the left side of the table are___________. Groups three through 12 contained metals known as __________. Elements on the right side are _____________.

Periods, metals, transition element, nonmetals

____________ a metal found both in your bones and in famous statues and churches

Calcium

__________ metals that occur sometimes in pure form in nature and also make many colored compounds

Transition

___________ the poisonous liquid metal

Mercury

____________ the main metal item in the green molecule of plants

Magnesium

___________ a type of element with a nucleus that breaks apart and gives off energy

Radioactive

__________ a common use for copper silver and gold

Coins

__________ the photography metal

Silver

__________ metals and their compounds explode to give spectacular colors

Fireworks

_________ all of this group is radioactive and unstable

Actinides