35 POINTS An atom of an element has 54 protons. Some of the element’s atoms have 77 neutrons.

Others have 79 neutrons.

What is the mass number for the atom that has 77 neutrons?
What element is this? (Write the full name of the element.)
How many electrons does this element have?
What is its atomic number?
What is the mass number for the atom that has 79 neutrons?
What element is this? (Write the full name of the element.)
How many electrons does it have?
What is its atomic number?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

7. in the cycle, a virus integrates its dna into the host's dna, and its dna is replicated when the host dna is replicated. a. infectious b. retroviral c. lysogenic d. lytic

Once similarity and one difference between a mixture of elements and a mixture of compounds