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year 9 Science Homework Week 3
By Naomi Arthur
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Last updated over 4 years ago
19 questions
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Question 1
1.
Who developed the atomic model adding that electrons orbit the nucleus at specific distance?
Rutherford
Chadwick
Bohr
Question 2
2.
What is the maximum number of electrons in the first shell?
1
2
8
Question 3
3.
What is the maximum number of electrons in the second shell?
1
2
8
Question 4
4.
Magnesium has 12 electrons. How many electrons will magnesium have in its 1stshell?
2
8
12
Question 5
5.
Magnesium has 12 electrons. How many electrons will magnesium have in its 2nd shell?
2
8
12
Question 6
6.
Magnesium has 12 electrons. How many electrons will magnesium have in its 3rd shell?
2
8
12
Question 7
7.
What do carbon-12, carbon-13 and carbon-14 all have in common?
Same number of neutrons
Same number of protons
Different number of protons
Question 8
8.
What is different about carbon-12, carbon-13 and carbon-14?
Number of protons
Number of neutrons
Number of electrons
Question 9
9.
An isotope is…
a version of an element with the same number of protons and neutrons but a different number of electrons.
a version of an element with the same number of neutrons and electrons but a different number of protons.
a version of an element with the same number of protons and electrons but a different number of neutrons.
Question 10
10.
How will adding neutrons to carbon-12 change it?
Change the atomic number
Change the element
Change the mass number
Question 11
11.
What is the correct calculation to find the relative atomic mass of an atom?
Relative atomic mass (Ar) = ((% × mass) + (% × mass)) / 100
Relative atomic mass (Ar) = 100 / ((% × mass) + (% × mass))
Relative atomic mass (Ar) = ((% × mass) - (% × mass)) / 100
Question 12
12.
What is the difference between the isotopes helium – 4, helium – 3, and helium – 5?
Number of protons
Number of neutrons
Number of electrons
Question 13
13.
Hydrogen-1 has 0 neutrons, hydrogen-2 has 1 neutron. How many neutrons does hydrogen-3 have?
1
2
3
Question 14
14.
What did scientists use to order elements by?
Atomic number
Atomic weight
Proton number
Question 15
15.
A.What is the correct definition on an element?
A substance composed of only one type of particle
A substance composed of only one type of atom
A substance composed of only one type of element
Question 16
16.
A.What is a period on the periodic table?
A horizontal row
A vertical column
A block of elements
Question 17
17.
What is a vertical column on the periodic table?
A period
An element
A group
Question 18
18.
Approximately how many elements are there?
20
50
100
Question 19
19.
D.What is a substance composed of only one type of atom?
atom
element
particle