Helium (He)
Explanation:
In the picture we see the following elementary particles:
2 electrons - the two spheres with negative charge which orbit around the nucleus
2 protons - the two spheres with positive charge in the nucleus
2 neutrons - the two spheres with no charge in the nucleus
The element will be Helium (He), because it have the atomic number 2 and the mass number 4, which means it contains 2 electrons, 2 protons and 2 neutrons.
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It's called a nebula or nebulae (plural). They are not only massive clouds of dust, hydrogen and helium gas, and plasma; they are also often “stellar nurseries” – i.e. the place where stars are born.
Answer:
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Explanation:
According to hooks law "provide the elastic limit of an elastic material is not exceeded the extension e is directly proportional to the applied force F"

where F= applied force
k= spring constant
e= extension
Given data
length of string l = 16cm
extension e = 20-16= 4cm
applied force = 5N
we need t o first calculate the spring constant k
apply the formula


we can now calculate the extension of the string when supporting a 6N weight

The length of the string when supporting a 6N weight is

<em>COMMENT </em><em>:According to the analysis an extra weight of 1N will cause add 0.8cm to the length of the string</em>