Science: Unit 1, Chapter 3, Elements and The Periodic Table

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energy level

a region of an atom in which electrons of the same energy are likely to be found

periodic table

an arrangement of elements in which the elements are separated into groups based on a set of repeating properties

the __________________ tells the number of protons in the nucleus of every atom in an element.

atomic number

A ____________ is the particle of an atom that moves rapidly in the cloudlike region around the nucleus.

electron

The sum of the protons and neutrons in the nucleus of an atom is the __________________.

mass number

The positively charged particle if an atom is called a __________.

proton

Which two particles in an atom are equal in number?

protons and electrons

What two particles account for almost all the mass of an atom?

protons and neutrons

Which two particles are found in an atom's nucleus?

protons and neutrons

What three particles are found in an atom?

protons, neutrons, electrons

What do elements in the same group have in common?

same number of valence electrons and similar chemical properties

atomic number

the number of protons in the nucleus of an atom

luster

the quality of giving off light, brightness, glitter, brilliance

Isotope

Atoms of the same element that have different numbers of neutrons

How are elements identified in terms of their atoms?

By their atomic number

Mendeleev

Created the first periodic table. Arranged elements by increasing atomic mass

True or False? Moving across the periodic table from left to right, one finds, in order, metals, gases, then nonmetals

False. Metalloids not gases.

What do elements in the same period have in common?

In the same family, similar characteristics.

proton

Small, positively charged particles that are found in the nucleus of an atom

atomic mass

The average mass of all the isotopes of an element

Atom

The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element.

nucleus

The central core of an atom containing protons and neutrons

Electron

A tiny, negatively charged particle that moves around the nucleus of an atom.

metal

A class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity.

group

A column on the periodic table of elements

period

A horizontal row of elements in the periodic table

neutron

A small particle in the nucleus of the atom, with no electrical charge

An element's ____ is its column in the periodic table.

group

atoms of the same element that have different numbers of neutrons are called _____________.

isotopes

What physical properties are shared by most metals?

luster, malleability, ductility, conductivity, solid at room temp.

A particle with no charge is a _____________.

neutron

The ____________ is the very small, dense center of an atom.

nucleus

chemical symbol

one or two letters that represent an element

An element's ____ is its row in the periodic table.

period


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