Periodic Table
What side of the periodic table are the metals on?
Left
Taking away an electron from an atom gives it a ______________ charge.
What is positive?
What subatomic particle stays the same in all isotopes?
Protons
How many valence electrons does Chlorine have?
7
The periodic table is organized in increasing what number?
Atomic Number
Elements are represented by the letters you see on the periodic table called _________.
What are chemical symbols?
A positively charged ion is
What is cation?
Isotopes are atoms of the same element that have different numbers of
What are neutrons?
How many valence electrons are in group 16?
6
In a neutral atom, the number of electrons equals the number of ______________
The horizontal rows on the periodic table are called ______________.
What are periods?
A negatively charged ion is
What is anion?
Protons and neutrons are found within the ______________ of an atom.
What is nucleus?
Electrons orbit around the nucleus of an atom in an electron cloud and are located on ____________.
What are energy levels?
Is Silicon a metal, nonmetal, or metalloid?
Metalloid
The elements that touch the “staircase” on the periodic table are ______________.
What are metalloids?
Aluminum with 10 electrons.
What is Al+3?
To find the number of neutrons in an element, you need to subtract the number of protons from the
What is atomic mass?
1
Which element would have a larger atomic radius, Hydrogen or Potassium?
Potassium
In a stable atom, the atomic number is equal to the number of what?
Protons and Electrons
An atom becomes an ion when the number of what changes?
Electrons
A chlorine atom has a mass of 38 and an atomic number of 17. How many neutrons does it have?
21
How many valence electrons do we need to consider the element stable?
8
Who organized the modern periodic table?
Dmitri Mendeleev