The Atom
All matter is composed of tiny particles that cannot be directly observed called ___________, which scientists study using ___________.
Atoms are studied using models.
Mendeleev’s periodic table was organized by increasing _________ __________.
atomic mass
The elements in the same group or column have ____________ properties.
similar
For a hydrogen-3 atom, what does the 3 represent?
Atomic mass of that isotope
My symbol is O and my atomic mass is 16.
What is oxygen?
Which particle of an atom has a negative charge?
Electron
The modern periodic table is organized according to increasing __________ __________.
Atomic number
What can you predict by looking at an element’s location in the periodic table?
Its properties
What is the specific name given to a chlorine-37 atom? Hint- Examine the number of subatomic particles.
It is an isotope of chlorine.
I have 16 electrons whizzing through my electron cloud.
What is sulfur?
Which part of an atom has no charge? Which particle has a positive charge?
Neutron = neutral/no charge
Proton = positive charge
What piece of information on the periodic table determines the identity of any atom? What does this bit of information tell you about the atoms of that element?
Atomic number- tells you the number of protons in the nucleus of the atom of any element
Which group of METALS is the most reactive?
Group 1A
What is the overall charge of a chlorine-35 atom, a chlorine-37 atom, or any isotope? Explain your answer.
“0” (no overall charge) because the number of protons and electrons are equal, so the charges cancel out.
With an atomic mass of 39 and 20 neutrons in my nucleus, I am a very reactive metal.
What is potassium?
The center part of an atom that contains 2 of the 3 subatomic particles is called the atom’s __________.
Nucleus
What’s the difference between groups and periods on the periodic table?
Groups are the vertical columns while periods are the horizontal rows.
DAILY DOUBLE!!!
Which TWO groups contain the most reactive elements? How do you know?
Groups 1A and 7A because as you go down to the left and up and to the right (until Fluorine) you get more reactive elements.
How many protons and neutrons does a lithium-7 atom have?
Lithium-7 has 3 protons and 4 neutrons.
I am the head of my family in the Halogens, and an important element in helping fight tooth decay.
What is flourine?
Describe each part of an atom in terms of its location.
Protons and neutrons make up the nucleus, while electrons move around the nucleus in a cloud-like region (Shells).
DAILY DOUBLE!
What is the name of the element found in Group 7A, Period 3? Also, what is its atomic number, chemical symbol, and average atomic mass?
Chlorine, 7A (atomic #), Cl (symbol), and 35.45 atomic mass units
Give an element that would have similar properties to (a) Xenon (# 54), (b) Bromine (# 35).
Xenon- any element in Group 8A
Bromine- any element in Group 7A
How many protons, neutrons, and electrons does the most common isotope of oxygen have? What would be the atom’s overall electric charge if it had 2 more electrons?
Oxygen-16: 8 protons, 8 neutrons, and 8 electrons
(0 overall electric charge)
8+ & 10- equals -2 overall electric charge
My properties are so unique I have my own separate space on the Periodic Table. I was also the end of the Hindenburg.
What is hydrogen?