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Q 1/40
Score 0
1. A certain sample of element Z contains 60% of 69Z and 40% of 71Z. What is the relative atomic mass of element Z in this sample?
30
69.2amu
70.0amu
69.8amu
70.2amu
Q 2/40
Score 0
What is the difference between two neutral atoms represented by the symbols Co and Ni?
30
The number of protons, neutrons and electrons.
The number of neutrons only.
The number of protons and electrons only.
The number of protons and neutrons only.
40 questions
Q.
1. A certain sample of element Z contains 60% of 69Z and 40% of 71Z. What is the relative atomic mass of element Z in this sample?
1
30 sec
Q.
What is the difference between two neutral atoms represented by the symbols Co and Ni?
2
30 sec
Q.
The electron arrangement of sodium is 2.8.1. How many occupied main electron energy levels are there in an atom of sodium?
3
30 sec
Q.
What is the electron arrangement of silicon?
4
30 sec
Q.
Which is correct for the chromium isotope 53 Cr?
5
30 sec
Q.
Group can be defined as:
6
30 sec
Q.
Period can be defined as:
7
30 sec
Q.
Atomic number can be defined as:
8
30 sec
Q.
Atomic Mass Number can be defined as:
9
30 sec
Q.
AMU is the unit used to measure relative atomic mass, what do the amu abbreviation stand for?
10
30 sec
Q.
What group would Boron be found on in the periodic table?
11
30 sec
Q.
Oxygen electron configuration is:
12
30 sec
Q.
Argon would be in period _____ on the periodic table.
13
30 sec
Q.
What is the energy level of Al ?
14
30 sec
Q.
When calculating protons number you use _______________.
15
30 sec
Q.
Balance the following equation:
16
30 sec
Q.
Balance the following equation:
17
30 sec
Q.
What charge does a proton have?
18
30 sec
Q.
What charge does a electron have?
19
30 sec
Q.
What charge does a neutron have?
20
30 sec
Q.
Neutrons and Protons have a mass of?
21
30 sec
Q.
NaCl is an example of a_________.
22
30 sec
Q.
How many protons and element magnesium?
23
30 sec
Q.
An atom of an element contains 66 electrons. Which elements is it?
24
30 sec
Q.
An atom of an element contains 14 protons. Which element is it?
25
30 sec
Q.
Do the atoms shown in the figure have the same atomic number?
26
30 sec
Q.
Isotope can be defined as:
27
30 sec
Q.
Nitrogen 13, Nitrogen 14 and Nitrogen 15 are all isotopes of Nitrogen. Do these isotopes have different atomic mass number or atomic number?
28
30 sec
Q.
Boron (B) has two naturally occurring isotopes: boron-10(abundance=19.8%, mass=10.1013amu) and boron-11 (abundance=80.2%, mass=11.009amu). Calculate the atomic mass of boron.
29
30 sec
Q.
Copper has two isotopes: Cu63 (abundance = 69.2%, mass=62.930 amu) and Cu65(abundance = 30.8%, mass=64.928 amu). Calculate the atomic mass of copper
30
30 sec
Q.
Three magnesium isotopes have atomic mass and relative abundances of 23.98amu (78.99%), 24.986amu (10.00%), and 25.982amu (11.01%). Calculate the atomic mass of magnesium
31
30 sec
Q.
A sample of an unknown isotope decays were recorded and graphed below. The original percentage of the unknown was 100%. What is the 2 half-life’s of this unknown compound?
32
30 sec
Q.
On average how long did it take for the unknown element to complete 1 half life?
33
30 sec
Q.
How many half life did it take for the Co element to decrease to .625g?
34
30 sec
Q.
What was the starting amount in grams of the Co redioactive material?
35
30 sec
Q.
A 20.0-g sample of sucrose contains 8.4 g of carbon. What is the mass percentage of carbon in sucrose?
36
30 sec
Q.
Which of the following is a compound?
37
30 sec
Q.
What is the sum of the number of protons and neutrons in an atom's nucleus?
38
30 sec
Q.
The type of radiation that has the greatest penetrating ability is _____.
39
30 sec
Q.
Is this statement true or false. 'An atom’s nucleus contains its protons and electrons'.
