Atomic Structure
What is the center of an atom called?
Nucleus
What is the horizontal row in the periodic table called?
period
Where are electrons located in an atom?
in the space surrounding the nucleus or the electron cloud
Whats the element symbol for hydrogen?
H
What is a molecule?
two or more atoms connected by chemical bonds, which form the smallest unit of a substance that retains the composition and properties of that substance
What particles make up the nucleus of an atom?
protons and neutrons
What element has the atomic number 6?
carbon
What is the charge of an electron?
negative
How many protons does Carbon (C) have?
6
What is the chemical formula for water?
H2O
What is the charge of a proton?
positive
What information does the atomic number provide?
the number of protons in the nucleus of an atom of that element
How many electrons can the first energy level hold?
2
Why do scientists create models?
to visualize and understand the structure and behavior of molecules at the atomic level
What is the difference between a compound and a molecule?
Compound are made up of two or more DIFFERENT atoms and molecules are made up of two or more atoms that can be the same or different
What is the term for atoms of the same element with different numbers of neutrons?
Isotopes
What are the vertical columns in the periodic table called?
groups
How many electrons can the last energy level hold?
32
What element is Fe?
Iron
TRUE OR FALSE: All compounds are molecules but not all molecules are compounds.
true
Describe the difference between an atom and a molecule.
An atom is the smallest unit of matter, a single particle of an element, while a molecule is a group of two or more atoms that are chemically bonded together
How are elements in the same group similar?
they have the same number of valence electrons in their outermost shell, and share similar properties
How many electrons does cobalt have?
27
Draw the model of CO2
0--c--0
Is BH4 a compound or element(molecule)
compound