What do the numbers listed for an element on the periodic table represent
2 answers:
There are usually two values you'll come across on the periodic table.
1. the atomic number.
this represents the number of protons an element has. For example, hydrogen (H) has an atomic number of 1, which means that hydrogen has only one proton.
2. the mass number.
this usually represents the number of protons and neutrons an element has. For example, carbon (C) has a mass number of roughly 12, which means that the sum of its protons and neutrons add up to about 12. We know carbon has an atomic number of 6 (6 protons) so the number of neutrons must be 6 aswell.
(the mass numbers can differ depending on which periodic table you are given)
1. the atomic number.
this represents the number of protons an element has. For example, hydrogen (H) has an atomic number of 1, which means that hydrogen has only one proton.
2. the mass number.
this usually represents the number of protons and neutrons an element has. For example, carbon (C) has a mass number of roughly 12, which means that the sum of its protons and neutrons add up to about 12. We know carbon has an atomic number of 6 (6 protons) so the number of neutrons must be 6 aswell.
(the mass numbers can differ depending on which periodic table you are given)
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Answer:
D. 4.75 m/s west
Explanation:
You can immediately get the answer once you know the formula for<em> velocity.</em>
- The formula for velocity is: Velocity (V) =
The distance is 95 meters while the time is 20 seconds. All you have to do is to divide <u>95 meters by 20 seconds</u>.
Let's solve:
- V =
- V =
- V = 4.75 meters per second
Since Brenda is going west with her her skateboard, then you have to add <em>west </em>as her direction.
Brenda's velocity is 4.75 m/s west.