Atomic Structure And The Periodic Table

Question 1

What side are the metals and non metals on in the periodic table

Answer 1

• metals left and center

- non metals right

Question 2

What non metal elements exist as molecules that are made up of two atoms joined together

Answer 2

• iodine
• bromine
• chlorine
• fluorine
• oxygen
• nitrogen
• hydrogen

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Question 3

What is a compound

Answer 3

Compounds contain two or more different element chemically combined in a fixed proportion

Question 4

What is an element

Answer 4

• in an element, all the atoms are the same

Question 5

What is an ion

Answer 5

A charged particle that forms when an atom or group of atoms lose or gain electrons

Question 6

What form do word equations take place in

Answer 6

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Question 7

What is an isotope

Answer 7

• atoms of the same element that have different numbers of neutrons

Question 8

Where are the mass numbers and atomic number

Answer 8

Mass top proton bottom

Question 9

How do u find out number of neutrons

Answer 9

Mass - atomic

Question 10

What is the relative atomic mass

Answer 10

• The average of the mass numbers of the different isotopes

- it is weighted for the abundance of each isotope (how common each isotope is)

Question 11

What is the equation for relative atomic mass

Answer 11

Relative atomic mass=

(Mass of number of isotope one X percent abundance of isotope 1)
+
(mass of number of isotope 2 X percent abundance of isotope 2)
————————————————————————-
100

Question 12

What do all atoms of an element have

Answer 12

The same number of protons

Question 13

How did Dmitri Mendeleev create the modern periodic table

Answer 13

• he arranged all elements in order of increasing atomic weight
• he would switch the order of specific elements so they fitted the patterns of other elements in the same group
• he realised some elements hadn’t been discovered so left gaps in his periodic table where the undiscovered elements should be

Question 14

Why did scientists think Mendeleevs table was correct

Answer 14

• Where he left gaps for the elements he thought hadn’t been discovered, he predicted the properties of the elements
• when they were discovered, the properties matched his descriptions

Question 15

How are the elements arranged in the modern periodic table compared to Mendeleevs

Answer 15

• modern periodic table is in order of atomic number (the number of protons)
• Mendeleev ordered the elements by atomic weight - modern periodic table has group zero
• Mendeleev doesn’t have group zero

Question 16

Why was there a problem with ordering by atomic weight

Answer 16

• the elements can appear in the wrong order due to the presence of isotopes

Question 17

What are group one and two on the periodic table

Answer 17

Highly reactive metals (fat left)

Question 18

What is in the centre of the periodic table

Answer 18

• The transition metals

- less reactive

Question 19

What is group zero

Answer 19

• noble gases (far right)

- all have a full outer energy level which is why they are unreacfive