Answer:
it is made up of two or more element
Answer:
Average velocity = 0.3 m/s.
Explanation:
Given data:
Total distance from house to store = 500 m
Distance he traveled from store and stop before reached to house = 200 m
Total time taken = 910 sec
Average velocity = ?
Solution:
Formula:
Average velocity = displacement / time
Displacement = distance from start - end point
Displacement = 500 m - 200 m = 300 m
Average velocity = 300 m/ 910 s
Average velocity = 0.33 m/s
Average velocity = 0.3 m/s.
The number of protons in an atom of krypton is 36.
<u>Explanation:</u>
The number written above the symbol of Kr in the periodic table represents the atomic number of the element . Then the number written in the below represents the mass number.
So the mass number of krypton is 84 and the atomic number of krypton is 36. As it is known that number of protons and electrons will be equal in a stable element. Thus, the krypton atom will be having 36 protons.
This process is called filtration.
MAGNESIUM IS HIGHER IN THE REACTIVITY SERIES.
Explanation:
The reactivity series of metals, also known as the activity series, refers to the arrangement of metals in the descending order of their reactivities.
The reactivity series provides information whether a metal can displace another in a single displacement reaction. It can also be used to obtain information on the reactivity of metals towards water and acids.
Magnesium reacts very slowly with cold water, but rapidly in boiling water, and very vigorously with acids.
Titanium reacts with concentrated mineral acids, pyrometallurgical extraction using magnesium, or less commonly other alkali metals, hydrogen or calcium in the Kroll process
.
