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.
An atom’s nucleus can emit a particle, emit a gamma ray, or split in a fission. These are examples of what?
Nuclear changes
