Atoms
The center of an atom contains:
Protons and neutrons
What is the law of conservation of mass?
That matter cannot be created nor destroyed but only changed.
What are the charges of the following:
proton
neutron
electron?
+
no charge
_
The rows in a periodic table are called ?
Periods
a Diatom is...
A molecule made of two atoms of the same element.
The smallest part of an element that has the characteristics of that element is:
The atom
How many hydrogen atoms in 2H2SO4?
4
Valence electrons are the number of electrons in the _————-?
Outer most energy level or shell.
The vertical columns in a periodic table are called
Groups or families
Is a compound a molecule? Why?
Yes because it is made up of two or more atoms.
What would the atomic mass be if an atom has 5 protons 6 neutrons and 5 electrons?
11 amus
In the equation 2H2 + O2→2H2O if the are 5 gms of hydrogen gas in the reactants and 11 gems of water in the products how many gems of oxygen gas’s will there be?
6
How many electrons can the first energy level hold?
2
Elements of in the same _______ have similar characteristics.
Group or family
Are all molecules compounds? Why or why not?
No only the ones that are made up of 2 or more different elements.
An atom that has gained or lost an electron is an:
Ion
Does the following equation follow the law of conservation of mass?
2H2 + O2 ⇌ 2H2O
Yes
How many valence electrons in the element carbon with the atomic number 6?
4
The periodic tables can be divided into three groups called
Metals, nonmetals, metaloids
which one is a mixture?
A. G G G G G
B. HhHhHHHh
B.
Two atoms with the same atomic number but a different atomic mass are called:
Isotopes
To balance the equation how many oxygen atoms would be needed on the reactants side?
C6H6O + ?O2 ⇌ 6CO2 + 3H2O
7
How many electrons in each energy level of the element oxygen With the atomic number 8?
First 2
second 6
These metals are shiny, conduct electricity, and are malleable.
Metals
Is a glass of (H2O)water a mixture or a pure substance?
Pure substance