Atomic Structure
This particle has a positive charge
What is a proton?
Elements are arranged in order of increasing this.
What is atomic number?
Anything that has mass and takes up space.
What is an element?
Melting ice is this type of change.
What is a physical change?
The smallest unit of an element?
What is an atom?
This particle is found outside of the nucleus.
What is an electron?
Elements in the same column are called this.
What are groups?
Water is an example of this type of substance made from two elements.
What is a compound?
Rust forming on iron is this type of change?
What is a chemical change?
What is neutral (or no charge)?
The center of an atom, containing both protons and electrons.
What is the nucleus?
These elements are usually shiny and good conductors.
What are metals?
The three common states of matter.
What are solid, liquid, and gas?
A sign that a chemical reaction may have occurred.
What is color change, gas production, temperature change, or precipitate formation?
The element symbol for oxygen.
What is O?
The atomic number tells you the number of these.
What are protons?
These elements have properties of both metals and nonmetals.
What are metalloids?
What is an element?
During a physical change, this stays the same.
What is the identity of the substance?
This determines the identity of an element.
What is the number of protons?
An atom has 12 protons and thirteen neutrons. Its atomic mass is this.
What is 25?
The horizontal rows on the periodic table are called this.
What are periods?
In a compound, the tiny number represents this.
What is number of atoms?
The law stating that matter cannot be created or destroyed?
What is the Law of Conservation of Mass?
If an atom has 15 protons and 18 neutrons, it has this many electrons if it is neutral.
What is 15?