cc4-the periodic table

Question 1

how did Mendeleev organise his periodic table

Answer 1

by increasing atomic mass

Question 2

what did Mendeleev do to his periodic table that made his more successful than others

Answer 2

• Left gaps for certain elements
• Swapped elements around
• He did this because he realised a trend in the chemical and physical properties in relation to the groups of elements

Question 3

how did Mendeleev predict the properties of undiscovered elements

Answer 3

He identified the trend in properties down a group and used this information to estimate the properties of undiscovered elements

Question 4

why does iodine come after tellurium in the periodic table

Answer 4

because the chemical properties were closely aligned with fluorine chlorine and bromine

Question 5

what are the differences between Mendeleev and the modern periodic table

Answer 5

• modern periodic table is organised by relative atomic number rather than RAM
• modern periodic table has no gaps
• the transition elements are listed in a separate block

Question 6

How does the electron configuration of an atom relate to its position on the periodic table in terms of group and period

Answer 6

• The total amount of electron shells will be the period it is in.
• The number of electrons in its outermost shell is equal to the group that it’s in.

Question 7

How do atoms store electrons

Answer 7

• Atoms have electrons in orbits of electron shells around the nucleus
• The first shell holds up to 2 electrons
• The second and third shell holds up to 8 electrons

Question 8

What are the four main features of the modern periodic table

Answer 8

• Elements in a period are in order of increasing atomic number
• Elements with similar properties are in the same group
• Non-metals are on the right and metals are on the left

The Iodine Tellurium pair reversal is explained

Question 9

What is similar about elements in the same group

Answer 9

They have the same number of electrons in their outermost shell

Question 10

How many elements are in the periodic table

Answer 10

118

Question 11

What happens when metals react

Answer 11

Because they have less electrons in their outer shell when they react they loose 1 or more negatively charged electron to form positively charged ions

Question 12

Properties of metals

Answer 12

• High melting and boiling points
• good conductors of heat and electricity
• solids at room temperature (except mercury)

Question 13

What happens when non-metals react

Answer 13

Because they have many electrons in their outer shell they gain an electron to form negatively charged ions (anion)
Or share electrons to form neural molecules

Question 14

Properties of non-metals

Answer 14

• low melting and boiling points
• often found as gases
• generally don’t conduct heat or electricity