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Chemistry - Atoms
It was once thought that electrons orbited the nucleus of an atom like planets around a star.

Chemistry - Atoms

This Chemistry quiz is called 'Chemistry - Atoms' and it has been written by teachers to help you if you are studying the subject at high school. Playing educational quizzes is a user-friendly way to learn if you are in the 9th or 10th grade - aged 14 to 16.

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In order to understand Science in high school, students must be familiar with the basic and fundamental ideas of Chemistry, such as atoms, bonding and the periodic table of elements. This quiz looks at atoms in particular.

An element is made up from what?
Two or more different types of atom
One type of atom
An easy start - or was it? If you don't know your definitions of elements and compounds, revise them hard before the exam arrives
Which of the following elements is not found in CaHCO3?
Atoms are represented by symbols. Where the symbol has more than one letter, only the first one is a capital. That's what makes this question tricky. A lot of students see the CO part of the formula and immediately think it is cobalt. It is not as there are 2 capital letters. So the moral of this is to pay attention to the capital letters!
What particles are present in the nucleus of an atom?
Protons only
Neutrons only
Electrons only
Protons and neutrons
Ernest Rutherford was the famous scientist who lead the team that discovered the nucleus
Where are the electrons found?
In a single group close to the nucleus
Orbiting the nucleus like the planets of the Solar System
In 'shells' surrounding the nucleus
Fixed in place at different distances from the nucleus
The shells are not physical things, they are just the areas where you will find the electrons as they orbit the nucleus. They can also be referred to as energy levels
Which of the following give the charges in order for the proton, neutron and electron?
+1, 0, -1
0, +1, -1
-1, +1, +1
+1, +1, -1
If you weren't sure, you can remember the charges like this:
Protons - P for positive
Neutrons - NEUT for neutral
So the electrons must be negative
Which of the following statements is true in an atom?
The number of protons is always equal to the number of electrons
The number of protons is always equal to the number of neutrons
The number of protons is sometimes equal to the number of electrons
The number of protons is never equal to the number of electrons
The important thing to remember about atoms is that they are electrically neutral so the positive charges of the protons are balanced by having the same number of electrons. If they are not the same, you have an ion, not an atom
Atoms of a particular element all have the same number of what?
The number of protons is what gives each element its own unique identity. So all atoms that contain 6 protons in the nucleus will be the element carbon, regardless of the number of neutrons
The element Argon has an atomic number of 18 and a mass number of 40. Which of the following statements is true.
Argon has 18 protons and 22 neutrons
Argon has 18 neutrons and therefore 18 electrons
Argon has 18 electrons and 22 protons
Argon has 18 neutrons and 22 protons
The atomic number gives you the number of protons (and therefore the number of electrons) in the atom. It is sometimes called the proton number.The mass number is the total number protons plus neutrons. If you subtract the atomic number from the mass number you get the number of neutrons
Which of the following represents the arrangement of the 18 electrons in the Argon atom?
The first 3 electron shells (energy levels) are all complete which is what makes it so difficult to get argon to react with anything
The element sodium has an atomic number 11 and mass number 23. Which of the following gives the correct number of protons, neutrons and the electron arrangement in the correct order?
23, 11, (2.8.1)
12, 11, (2.6.3)
11, 12, (2.8.1)
11,12, (8.2.1)
Sodium is in group I of the periodic table because it has 1 electron in its outer energy level
Author:  Kev Woodward

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