Krypton is in group 18, and so it has 8 valence electrons. B is the answer
B; Seismometer would be the answer.
Answer: 
, 0.533 L
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
According to avogadro's law, 1 mole of every substance occupies 22.4 L of volume at STP.
Number of moles =
moles of calcium carbonate = 
As 1 mole of calcium carbonate produces = 22.4 L of carbon dioxide at STP
Thus 0.0238 moles of calcium carbonate produces =
of carbon dioxide at STP
The resistance of the wire is dependent on temperature, diameter and nature of the material.
<h3>What is resistance?</h3>
The term resistance refers to the opposition offered to the flow of current in a circuit. The resistance is obtained form Ohm's law which states that;
V = IR
Where;
V = voltage
I = current
R = resistance
Hence, the resistance is dependent on;
- temperature
- diameter
- material
Learn more about resistance: brainly.com/question/15067823
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.
