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Q 1/10
Score 0
How many protons, neutrons and electrons are present in an atom of Hafnium, Hf, with a mas number of 178?
30
178 protons, 250 neutrons, 72 electrons
72 protons, 106 neutrons, 72 electrons
106 protons, 72 neutrons, 106 electrons
72 protons, 106 neutrons, 178 electrons
Q 2/10
Score 0
What is the atomic mass of Neon rounded to the nearest whole number?
30
20
10
20.18
10.18
10 questions
Q.
How many protons, neutrons and electrons are present in an atom of Hafnium, Hf, with a mas number of 178?
1
30 sec
Q.
What is the atomic mass of Neon rounded to the nearest whole number?
2
30 sec
Q.
What element is represented in this Bohr Model?
3
30 sec
Q.
What subatomic particle of an atom always determines the element’s identity?
4
30 sec
Q.
An atom of a certain element has 36 protons, 36 electrons and a mass number of 84. At room temperature this element is a very stable gas. How many neutrons are in this atom?
5
30 sec
Q.
In the early 1900's Ernest Rutherford completed an experiment that changed the concept of an atom. His discovery led to the understanding that an atom is mostly made up of empty space with -
6
30 sec
Q.
A model of a beryllium atom is shown. What type of particles are in the cloud surrounding the atoms nucleus?
7
30 sec
Q.
What is the mass number of a potassium (K) atom that has 20 neutrons?
8
30 sec
Q.
An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the atoms nucleus?
9
30 sec
Q.
Which of the following best describes an electron?
