WorksheetsAtoms and elements
Total questions: 35
Worksheet time: 18mins
In a chemical formula, the numbers as subscripts show how many of each kind of ______ are in the compound
atoms
moles
molecules
all of them are correct
Compounds are composed of more than five atoms chemically bonded.
True
False
Elements are made up of one kind of atom and the symbol for each element is unique.
True
False
Metals make up the majority of elements in the periodic table.
True
False
Metalloids or semimetals
Have properties (characteristics) of both metals and nonmetals.
Found on the right side of the periodic table.
Elements that are mostly metal.
Families&Groups
Vertical columns on the periodic table.
Part of your family tree.
Are studied at period table from left to right.
Atomic number is the...
Number of protons in the nucleus of each atom.
Number of protons in a compound.
Number of atoms in an element.
Covalent Bond is
Bond that forms between non-metal atoms when they share electrons.
something that keeps gasses flowing.
Found in the nucleus.
Ionic Bond is
Strongest bond.
Something that keeps metals together.
Bond between metal and non-metal that holds oppositely charged ions together.
Chemical Bond
Only found in plants.
The force that holds two atoms together.
Keeps matter solid.
Chemical symbol for oxigen is...
OX
Ox
O
G
Chemical symbol for chlorine is...
cL
C
L
Cl
Chemical symbol for magnesium is...
Mg
MG
Mn
MN
Chemical symbol for phosphorus is...
ph
fo
FO
P
According to Rutherford's model, at the core there are:
Protons and electrons
Protons and neutrons
Protons only
Any of them
According to Dalton's atomic theory...
Atoms are small indestructible particles
The atoms of the same element always have the same mass, but its properties depend on the area where it is located
In a chemical change, atoms break apart to react
All of them
A positive ion or cation...
Has gained electrons
Has lost electrons
Has the same electrons as protons
Any of them
What was the first atomic model to add electrons?
Shrodinger
Thomson
Dalton
Rutherford
What is the atomic number?
It is the number of neutrons
It is the number of electrons
It is the number of protons
What was the first atomic model created
Dalton´s model
Rutherford´s model
Thomson´s model
Any of them
Electrons are found...
In the nucleus of the atom
In the nucleus and in the orbits
In the orbits
They are not part of the atom
The atom is made up of
Electrons and protons
Electrons and Neutrons
Neutrons, Protons and Electrons
Neutrons and Protons
The atomic number of an element is symbolized by the letter
A
B
P
Z
The atomic number (Z) tells me:
the amount of neutrons
The number of protons
The number of protons and also electrons that a NEUTRAL atom has
The number of electrons in an atom
If we subtract the mass number minus the atomic number (Z) of an element we are calculating:
The number of protons in the nucleus
The number of protons and electrons
The amount of neutrons it has in its nucleus
The number of neutrons the atom has in its orbit
What is "Fe"?
Carbon
Iron
irony
Hidrogen
The central region of an atom where there are neutrons and protons is called
Nucleus
Electron cloud
Core
Center
The first atomic model that proposed the existence of the electron was:
Sommerfeld´s model
Thomson´s model
Dalton´s model
Bohr´s model
Rutherford´s model
He proposed that electrons revolve around the nucleus at well-defined levels
Rutherford
Bohr
Dalton
Demócrito
Why is the atom electrically neutral?
Because protons and neutrons are separate
Because the number of protons (positive) equals the number of neutrons
Because it has the same number of protons as electrons
Because electrons are the representative charge of the atom
If two chemical elements have the same atomic number and different mass numbers they are
Isobars
Isocors
Isotopes
Any of them are correct
