Answer:
Alpha particle
Explanation:
The helium symbol is also used to represent he alpha particles.
For example:
The americium with atomic wight 224 undergo alpha decay and produce
₉₃Np²³⁷ . The alpha particle emitted is also called helium nuclei. During this decay some gamma radiations also produce as a byproduct.
₉₅Am²²⁴ → ₉₃Np²³⁷ + ₂He⁴
Properties of alpha radiation:
Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number 4 less than and atomic number 2 less than the starting atom.
Alpha radiations can travel in a short distance.
These radiations can not penetrate into the skin or clothes.
These radiations can be harmful for the human if these are inhaled.
These radiations can be stopped by a piece of paper.
If a mineral has a metallic shine and scratches, which of its properties are being measured?
Choose the two correct answers.
magnetism
hardness
cleavage
luster
Answer: hardness and luster
Answer: A
Explanation: because It shows how they mark there territory by unreining
The type of plate boundary is Convergent plate boundry.
<u>Explanation:</u>
Fold mountains mainly formed by the results of overlapping on layers in the top part of the crust. These mountains create while two tectonic plates push towards one another. When two opposed plates are shoving within each other is called Convergent plate boundry.
The drifting plates and continents get collided and the gathered rock layers will fall and fold, similar to a tablecloth pushed across the table. Since the crust has collided and the new crust formed by the rocks. The formed mountains are normally bigger in its length and shorter in breadth.
