Subatomic Particles
What is the charge of a proton?
+1
What does the atomic number of an element tell you?
Number of protons
What is a neutral/stable atom?
One with the same number of protons and electrons.
What element has 8 protons?
Oxygen
What are the 3 states of matter?
Solid, liquid, gass
What subatomic particle has a negative charge?
Electron
Mass number = ______ + ______.
Protons + neutrons
What is a cation?
A positively charged ion (more protons than electrons)
What element is in group 1, period 4?
Potassium
Matter is _________
Anything that has mass (can be weighed), and has volume (take up space)
Which subatomic particle determines the identity of an element?
Proton
An atom has a mass number of 23 and 11 protons. How many neutrons?
12 neutrons
What is an anion?
A negatively charged ion (more electrons than protons)
If you know the number of protons in an atom, what else do you automatically know?
The element’s identity
Atoms are the _______ of matter
building blocks
Where are protons and neutrons located in the atom?
The nucleus
If an atom has 6 protons and 8 neutrons, what is its mass number?
14 amu
An atom has 12 protons and 10 electrons. What is its charge? What type of ion is the atom?
+2 (cation)
A student claims an element with 12 protons is Sodium. Is this true or false? If the answer is false what is the correct element?
False, magnesium
Explain how to determine if an atom is an ion, using only the number of protons and electrons.
If protons ≠ electrons, it’s an ion.
More electrons = anion
Fewer electrons = cation
Which two subatomic particles have approximately the same mass?
Protons and neutrons (about 1 amu each)
An atom has 15 protons, 0 neutrons, and 15 electrons. What is its atomic mass and what elements is it?
15 amu and it is Phosphorous
An atom has 17 protons and 18 electrons. Is it a cation or anion, and what is the charge?
Anion, –1
Krypton is a type of _________. It is in group ___ and period _____. Its atomic # is ______
noble gas
18
4
36
An atom has 20 protons, 20 neutrons, and 18 electrons.
Identify the element, the mass number, and whether it's a cation or an anion. Explain your reasoning.
Element: Calcium (20 protons)
Mass number: 40
Charge: +2 (cation)