Polonium is a rare element with 33 radioisotopes. the most common one, 210po, has 82 protons and 128 neutrons. when 210po decays, it emits an alpha particle, which is a helium nucleus (2 protons and 2 neutrons). 210po decay is tricky to detect because alpha particles do not carry very much energy compared to other forms of radiation. for example, they can be stopped by a single sheet of paper or a few inches of air. that is one reason why authorities failed to discover toxic amounts of 210po in the body of former kgb agent alexander litvinenko until after he died suddenly and mysteriously in 2006. what element does an atom of 210po change into after it emits an alpha particle?

Explanation:

The unbalanced nuclear equation is

It is convenient to replace the question mark by an atomic symbol, , where x = the atomic number, y = the mass number, and Z = the symbol of the element .

Then your equation becomes

The main point to remember in balancing nuclear equations is that **the sums of the superscripts and the subscripts must be the same on each side of the equation**.  

Then

84 = x + 2, so x = 84 - 2 = 82

210 = y + 4, so y = 206

Element 82 is lead, so the nuclear equation becomes

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.