Which atom or ion is the largest? a. k b. k+ c. ca d. ca2+ e. li i think its either c or e the elements beryllium, calcium, and strontium are all in group 2. what is the correct relationship of these elements regarding their ionization energy? a. ca < be < sr b. sr < be < ca c. be < ca < sr d. sr < ca < be e. ca < sr < be which substances are made up of polymers? (pick more then one yall) dna a glass bottle ice crystals the proteins in hair rubber car tires

Size

As the charge increases (becomes more positive), the size decreases.

Also the number of protons and electrons matters in the atom itself. Li will have the smallest size because their are not that many electrons to repulse as say the Ca and K.

The largest member of that group is the one having the most number of electrons and is not an ion. In general the higher the charge, the smaller the radius.

K > K+ > Ca2+

A

Ionization Energy

As you go down the periodic table staying in the same column of the periodic table it takes LESS energy to break the outer shell electrons away. So the correct order for the column II elements is something like D.

Be is closest to the top of the periodic table and has the highest  ionization energy

Ca is the next closest to the top and has a medium size ionization energy

Sr has the lowest ionization energy.

Answer C is backwards.

Answers A B and E are all in the wrong order  of moving down Column II. The comment applies to staying in the same column and moving from top to bottom.

Polymers

A polymer is a complex combination of Carbon, Hydrogen and Oxygen (mainly). Other elements are possible but the majority is the listed ones.

DNA is a polymer

A glass bottle is made from SiO2 and is not a polymer

Ice crystals are actually water molecules. Those crystals are not polymers

Hair Proteins (like wool and silk) are made of polymers.

Rubber used for car tires are polymers.

You should count 3 items as your answer.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.