The model of the atom has dramatically changed over many many years.We learned atoms make up different substances and are the smallest particles of matter, which have subatomic particles that are very small portions of matter. At first scientist only thought there were electrons which are negatively charged.
Answer:
The nucleus of an atom is made up of positively charged protons and neutrally charged neutrons. The nucleus determines which element an atom is, based on the number of protons. For example, only Oxygen has 8 protons, Carbon has 6 protons, etc. The nucleus is about 1/100,000 of the size if the whole atom.
Answer:
There are 3 valence electrons in the element aluminum.
Throw it in the ocean lol
Answer:
Final temperature of object = 25°C
Explanation:
Given data:
Final temperature of object = ?
Mass of object = 10 g
Specific heat capacity of object = 1 cal/g.°C
Heat content = 50 cal
Initial temperature = 20°C
Solution;
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
Now we will put the values in formula.
50 cal = 10 g × 1 cal/g.°C × (T2 - 20°C)
50 cal/ 10 cal/°C = (T2 - 20°C)
5 °C = (T2 - 20°C)
5°C + 20°C = T2
T2 = 25°C