Elements and Principles

Is a pure substance that cannot be broken down into other substances.

• compounds

• elements

Atoms of the same element with different numbers of neutrons are called

• atomic numbers

• isotopes

• atomic neutrons

What makes an isotope radioactive?

• Changing the number of neutrons in an atom can cause the nucleus to decay, or break apart.

• Changing the number of protons in an atom can cause the nucleus to decay, or break apart.

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Atoms contain an equal number of protons and neutrons, so the overall charge of an atom is

• 0

• 10

• 100

• 1000

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Is the center of the atom where the neutrons and protons are located

• protons

• neutrons

• nucleus

Table of elements organizes information about elements in rows, called periods, and columns, called groups

• Periodic period

• Periodic table

• Pe3riodic elements

Which of the following is a fundamental principle of the periodic table?

• Elements are arranged by increasing atomic number

• Elements are arranged by decreasing atomic mass

• Elements are arranged alphabetically

• Elements are arranged by color

What is the principle behind the conservation of mass in a chemical reaction?

• Mass is created during a reaction

• Mass is destroyed during a reaction

• Mass is neither created nor destroyed

• Mass is converted to energy

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Which element is known for its principle of being a good conductor of electricity?

• Oxygen

• Copper

• Sulfur

• Helium

What principle explains why ice floats on water?

• Ice is denser than water

• Ice is less dense than water

• Ice is heavier than water

• Ice is lighter than air