2D-Composition of Matter Flashcards
___________ is the atom’s center.
Nucleus
What two subatomic particles are normally found in the nucleus of an atom?
Protons and neutrons
Protons have a _________ charge and neutrons have no electrical charge.
Positive
Electrons surround the atom’s nucleus and carry a _________ charge.
Negative
________ are atoms with more or fewer electrons than protons.
Ions
A chemical _________ is a pure substance made of one kind of atom.
Element
Elements are identified by their names, but also by their ______ __________, which is the number of protons in their nuclei.
Atomic number
A__________ _________ is when the elements of one atom bond with atoms from another element.
Chemical compound
What is an example of a chemical compound?
Water- H2O- 2 hydrogen elements and 1 oxygen element combine to make water.
The element _______ makes up most of the earth’s atmosphere.
Nitrogen
What are 3 ways that matter can change?
Physical changes, chemical changes, and nuclear changes
What are 3 examples of physical change?
Melting, cutting, crushing
_________ is the smallest building block of matter.
Atom
When a pure substance changes into another substance, a _________ change takes place.
Chemical
What is the law of conservation of matter?
Matter and energy can neither be created or destroyed, they can only change forms.
