Periodic table Flashcards
this is done
Chemists have arranged the chemical elements into a table called the periodic table. What two things does this help us do?
the periodic table helps us to make sense of the different properties of the elements and their compounds. It also helps us to predict how they will behave in different situations.
In the periodic table, the elements are arranged what order ?
In the periodic table, the elements are arranged in order of proton number, also called atomic number.
What else is the proton number known as?
The atomic number
What dies the atomic number tell us? Where is this shown?
This is the number of positive protons in each atom. The proton number is shown written underneath each element in the table
Putting elements in order gives a repeating pattern of their properties. In the periodic table each element is placed ……..those with similar properties. (Fill in the missing word)
Putting elements in this order gives a repeating pattern of their properties. In the periodic table each element is placed beneath those with similar properties.
When many of the elements had been discovered, attempts were made to put them into a sensible arrangement. During, the period of the 18th century, actual masses could not be measured so they were compared against the mass of hydrogen (the lightest). What is this called ?
This is called the relative atomic mass.
The periodic table gives us a great deal of information about each of the elements. If you know one of two facts about an element, you can use the table to find the other. What are the two facts?
The periodic table gives us a great deal of information about each of the elements. Firstly, the name and symbol of each element are shown. If you know one of these two facts about an element, you can use the table to find the other.
As well as the proton number shown below each element, another number is shown above it. This is the relative atomic mass of the element. It is a comparative measurement of the mass of one atom of the element. What can you use it for?.
You can use it to see how much heavier an atom of one element is compared with an atom of another element.
The periodic table is divided into horizontal rows and vertical columns. The first row has only two elements: hydrogen and helium. The next row has………elements, lithium to ……
Metals and ……..
Across each row, the elements on the left are ………., while those on the right are non-metals. The dividing line between metals and non-metals is shown in ….. on the table below.most of the elements are …….
The periodic table is divided into horizontal rows and vertical columns. The first row has only two elements: hydrogen and helium. The next row has eight elements, lithium to neon.
Metals and non-metals
Across each row, the elements on the left are metals, while those on the right are non-metals. The dividing line between metals and non-metals is shown in red on the table below. You can see that most of the elements are metals.
So group 1 contains what elements ?
So group 1 contains the elements lithium (Li) to francium (Fr), and group 7 contains the elements fluorine (F) to astatine (At).
Each column in the table contains elements with similar properties, called a …….. Each has a group number, shown where ?
Each column in the table contains elements with similar properties, called a group. Each has a group number, shown across the top of the table.
Because there are patterns in the way the elements are arranged in the periodic table, it can be used to …….their properties and interpret data.
Because there are patterns in the way the elements are arranged in the periodic table, it can be used to predict their properties and interpret data.
The table shows the melting points of some elements in group 1, with one value missing.
Melting points of some group 1 elements
This table shows the melting points of some elements in group 1, what is the one value missing?
Element Symbol of element Melting point/°C
Lithium Li 181
Sodium Na 98
Potassium K 63
Rubidium. Rb ?
Caesium Cs 29
The melting points show a pattern, or trend, down the group. It is therefore possible to predict that the melting point of rubidium is between 29°C and 63°C (it is actually 39°C). It is possible to predict both physical and chemical properties for elements in the same group.
What is used to give the order of the elements in the periodic table?
The periodic table is ordered in terms of proton number
In group 1 lithium (proton number 3) has a melting point of 181°C. Potassium (proton number 19) has a melting point of 63°C. What is the melting point of sodium (proton number 11)?
98 degrees
