Elements
This is a pure substance made of only one type of atom.
What is an element?
This is the basic building block of matter.
What is an atom?
This is an atom that has gained or lost electrons.
What is an ion?
These are atoms of the same element with different numbers of neutrons.
What are isotopes?
This subatomic particle has a positive charge.
What is a proton?
The number of protons tells us this about an element.
What element it is.
A neutral atom has the same number of protons and this particle.
What are electrons?
An atom becomes a positive ion when it loses this.
What are electrons?
Carbon-12 and Carbon-14 are examples of this.
What are isotopes?
This subatomic particle has no charge.
What is a neutron?
This element has 6 protons.
What is carbon?
If an atom has 8 protons and 8 electrons, its overall charge is this.
Neutral / zero charge.
A negative ion has more electrons than this particle.
What are protons?
Isotopes of the same element always have the same number of these.
What are protons?
This subatomic particle is found outside the nucleus.
What is an electron?
The chemical symbol for sodium is this.
Na
An atom with 11 protons must be this element.
Sodium
A chlorine atom becomes Cl⁻ when it gains this many electrons.
One electron
An atom has 7 protons and 8 neutrons. Its mass number is this.
15
Protons and neutrons are found in this part of the atom.
The nucleus
Two atoms are the same element because they have the same number of these.
Protons
An atom has 9 protons, 10 neutrons and 9 electrons. Its mass number is this.
19
Magnesium forms Mg²⁺ by losing this many electrons.
Two electrons
Hydrogen-1, Hydrogen-2 and Hydrogen-3 are different because they have different numbers of these.
Neutrons
This particle decides the charge of an atom or ion when compared to the number of protons.
Electrons