Ions
An atom with 11 protons and 10 electrons has what charge?
+1
What is an isotope?
Atoms of the same element with different numbers of neutrons
What is the formula for a compound formed between Na⁺ and Cl⁻?
NaCl
What is a period on the periodic table?
A horizontal row of elements
What are the three main subatomic particles?
Protons, neutrons, and electrons
What is the charge on an ion with 17 protons and 18 electrons?
–1
How many neutrons are in carbon-14?
8
What is the formula for magnesium and chlorine?
MgCl₂
What is a group or family on the periodic table?
A vertical column of elements with similar properties
Which subatomic particle has a positive charge?
Proton
If a neutral atom gains two electrons, what kind of ion forms, and what is its charge?
An anion with a –2 charge
An isotope of chlorine has a mass number of 37 and 17 protons. How many neutrons does it have?
20
Aluminum and oxygen form an ionic compound. What is its formula?
Al₂O₃
A mystery element is a gas that doesn’t react with anything. What family would it most likely belong to?
The noble gases
Where are protons and neutrons located in an atom?
In the nucleus
Magnesium has 12 protons. If it forms an ion with 10 electrons, what is the ion’s symbol?
Mg²⁺
Two isotopes of oxygen have mass numbers 16 and 18. What differs between them?
The number of neutrons (8 vs. 10)
What is the correct formula for calcium nitrate?
Ca(NO₃)₂
Describe where you’d find the metals, nonmetals, and metalloids on the periodic table.
Metals are on the left, nonmetals on the right, and metalloids are in between forming a staircase
If an atom has 15 protons and 16 neutrons, what is its mass number?
31
Iron can form Fe²⁺ or Fe³⁺ ions. How many electrons does each have?
Fe²⁺ = 24 electrons; Fe³⁺ = 23 electrons
A mystery element has 18 electrons and 22 neutrons, and its mass number is 40. Identify the element and isotope.
Argon-40
Iron(III) oxide forms from Fe³⁺ and O²⁻ ions. What is its formula?
Fe₂O₃
Which family of elements tends to form –1 ions
The halogens
An atom has a mass number of 31 and contains 15 protons and 18 neutrons. How many electrons does it have if its charge is –3?
18 electrons