Science test 10- 5th grade Science

The element that is the basic building block of all the compounds is ________.

The amount of matter in one unit of volume:

Most metals are ____________?

A very hard metal which is an important ingredient in stainless steel is:

A compound is a substance composed of one or more types of atoms bonded together.

A compound made of charged atoms:

The halogen that is useful as a bleach and a germ-killing agent is called:

The elements which do not combine with anything else except under unusual circumstances:

This is formed by electrons that are in orbit the same distance from the nucleus:

Iodine, when heated, does not melt but instead sublimes or turns to gas.

The halogen that is added to table salt to prevent a deficiency disease is called:

Two electrons attract each other.

The tiny, extremely dense core at the center of an atom is called the:

The two particles that make up the nucleus of an atom:

The number of protons an atom has:

The hardest of all known substances is:

A process in which atoms of elements or compounds are rearranged to form new substances.

The semimetal that is used to make computer chips is called:

The weight of an object changes from place to place:

The proton has a positive charge.

The simplest kind of atom with one proton and one electron is called:

If two objects have the same volume but different densities the object made of the denser substance weights less.

Anything that takes up space and has mass is called:

Formed by electrons zooming around the nucleus of an atom:

The densest of everyday metals is ___________.

The three main groups of elements are metals, semimetals and gases.

The halogen that is added to toothpaste and drinking water is called:

The metric unit that is used to measure an object's mass

Lacking an electrical charge:

A compound made of molecules:

Two or more atoms firmly bound together form a molecule

An element is a substance composed of multiple types of atoms

The colorless, odorless gas that makes up 78% of the earth's atmosphere is called:

The amount of matter that makes up an object:

The measure of the pull of gravity on an object:

A neutral atom has more protons than electrons.

The most abundant element at the surface of the earth is:

The rapid reaction of any substance with oxygen is called:

The study of what substances are made of and how one substance can be changed into another:

The tiny particles that swarm at tremendous speeds around the core of an atom:

The tiny particles of which all matter is composed:

The only metal that is liquid at room temperature is:

The organized arrangement of all known elements:

Highly reactive elements that tend to form compounds with alkali and alkaline earth metals are called: