Apiece of metal weighing 302.5 g is placed in a graduated cylinder containing 207.4ml of water. the volume of water now reads 238.0 ml. from these data calculate the density of the metal

9256.5 g/ml

Explanation:

Use the formula,

Density = mass/volume

;Where you need to calculate the volume change firstly,

Volume = 238.0 - 207.4

;Volume = 30.6 ml

; Hence for calculating density,

; Density = 302.5 × 30.6

; Density = 9256.5 g/ml

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.