The following are four real life examples of the result of scientific investigation:
1. The development of the whole human genome.
2. The discovery of penicillin.
3. The discovery of a drug that cures tuberculosis.
4.The discovery that atoms have different energy levels and that electrons are found at each level.
All these events comes about as a result of scientific investigations.
<span>Heat energy is transferred from warmer objects to cooler objects.
</span>
Question 1
Adding an electron has no effect on the mass number but it reduces the atomic number by 1.
So, 234 91 Protactinium plus 0 negative 1 electron results to Thorium234 and
<span>7 4 Beryllium plus 0 negative 1 electron will result to </span><span>Lithium7
</span>Adding a Helium particle increases the mass number of the daughter nuclei by 4 and the atomic number by 2.
So, <span>234 90 Thorium plus 4 2 Helium will results to </span><span>Uranium238 and
</span>222 86 Radon plus 4 2 Helium will result to <span>Radium226.
<span>Question 2
</span>The mass number is the sum of protons and neutrons. If an element has y protons and x neutrons, then its mass number will be (y+x).<span>
</span></span><span>88 38 Strontium. This element has a mass number of 88 and atomic number(number of protons) 38. Neutrons = 88 - 30 = 50.
Doing the same for the other elements we have;
</span>14 6 Carbon ⇒ Neutrons = 14 - 6 = 8
<span> 127 53 Iodine </span>⇒Neutrons = 127 - 53 = 74<span>
4. 39 19 Potassium </span>⇒ Neutrons = 39 - 19 = 20
Answer:
its beacuse there are millions of species in the world, and there are still mooooore speacies we still dont know about. its impossible to study all of them it will take a great amount of time to discover and study them.but, the most mysterious place is the ocean we know more about space than we know about the ocean. the ocean is sooo HUUUUUGGGGGE and massive it covers 70% of the world, imagine how many species will be in a place that covers 70% we still dont know about.
~batmans wife dun dun dun....