Atomic Structure
What subatomic particle determines the identity of an element?
Protons
Elements in the same group have the same number of
Valence electrons
An atom has gained or lost electrons is called a(n)____
Ion
How many oxygen atoms are in H2O?
1
The atomic number tells you the number of
Protons
Where are the neutrons found in an atom?
In the nucleus
Elements in the same period have the same number of
Energy levels
If an atom has 13 protons and 10 electrons, what is its charge?
+3
How many total atoms are in CaSo3
1 Ca
1 S
3 O
= 5 atoms total
The atomic mass is the total number of ___+____
Protons + Neutrons
How do you calculate the number of neutrons in an atom?
Atomic Mass (rounded)-atomic number
On the periodic table, where are the metals located?
On the left side
For isotopes of oxygen, what MUST stay the same?
Number of protons
In NaHCO3, how many oxygen atoms are there?
3
For chlorine (Cl), if the atomic number is 17, how many electrons does a neutral atom have?
17
A neutral atom has 11 protons. How many electrons does it have?
11
What group number contains the noble gasses (stable elements)?
Group 18
How does an atom become negatively charged?
It gains electrons
How many hydrogen atoms are in
C6 H12 O6
12
This part of the periodic table touches the staircase and has properties of both metals and non metals
metalloids
An atom has 16 protons, 16 electrons, and 18 neutrons. What is its mass number?
34
Sodium (Na), Potassium (K), and Lithium (Li) all belong to the same family. What family is it?
Alkali Metals (Group 1)
Two atoms of the same element with different numbers of neutrons are called
Isotopes
How many total atoms are in MgSO4
1 Mg
1 S
4O
=6 total atoms
A Bohr model shows an element with 2 energy levels and 7 valence electrons. Which family is it in?
Group 17 (Halogens)