Answer:
Atoms of the same chemical element do not always have the same mass because, although the number of protons in the nucleus is the same for all atoms of the same element, the number of neutrons is not. Most elements as they occur naturally on earth are mixtures of several isotopes.
Explanation:
1.Abbasid
2.Justinian's rule i believe
<span>Make me brainliest please </span>
Answer:
A. height above sea level.
The ansseer is Iridium.
The atomic number of iridium is 77 and it comes just before platinum (atomic number = 78).
In iridium,
The number of electrons = no. Of protons = 77.
The no. Of electrons and the no. Of protons is same as atomic number.
Answer:
B.75 kg
Explanation:
Given parameters:
Force on the object = 240N
Acceleration of the object = 3.2m/s²
Unknown:
Mass of the object = ?
Solution:
Force is the pull or push on an object. According to Newton's first law; it is mathematically expressed as;
Force = mass x acceleration
The unknown here is the mass, simply input the parameters and solve for it;
240 = mass x 3.2
mass = 
= 75kg
The mass of the object is 75kg
