Explanation: Ca generally loses two electrons from its outer shell to form a Ca2+ ion.
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Answer:
Valency - Number of outermost electrons
Explanation:
Periodic table are generally divided into rows and columns.
Each columns in the periodic table is referred to as groups. Each groups represent the valency of the element. That is, the total number of outermost electrons. Due to the same number of valency, elements in the same group show similar chemical properties.
This means that group 1 elements have a valency of 1 , group 2 elements have a valency of 2.
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The solute is salt, and the solvent is water. So the answer is #1.
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Answer:
2.67 x 10⁷km
Explanation:
Given parameters:
Time of arrival of p-waves = 2: 10: 00
Time of arrival of s-waves = 2: 15: 20
Unknown:
Distance of wave from epicenter = ?
Solution:
To find the distance of the wave from the epicenter;
Distance = 3 x 10⁸ x time interval
Time interval = Time of arrival of p-waves - Time of arrival of s-waves
= 2: 10: 00 - 2: 15: 20
= 5min 20s
= 320s
Now, we need to convert the time to hrs;
3600s = 1hr
320s = 
= 
hr
So,
Distance = 3 x 10⁸ x = 2.67 x 10⁷km
