Models of Atoms The atomic number of an element is determined by the number of p
ID: 1050362 • Letter: M
Question
Models of Atoms The atomic number of an element is determined by the number of protons. electrons. neutrons. isotopes. Two isotopes of an element have the same number of_but different numbers of___. Relate Cause and Effect How can an atom be electrically neutral when it contains particles that are charged? Relate Evidence and Explanation How did Rutherford's experimental evidence lead to the development of a new atomic model? A portion of the periodic table is shown above. Which element on the periodic table has properties that are most similar to those of nitrogen (N) and which element has properties that are the least similar? Explain your reasoning._Explanation / Answer
12) The number of protons in the nucleus of an atom of an element is called atomic number it’s represented by the symbol -Z
answer (a) protons
13) Isotopes are atoms that have same atomic number (protons) but a different of mass number (neutrons) is called isotopes .ex 1H1, 1H2
14) atoms are electrically neutral due to it has the same number of electrons (negatively charge) and protons (positively charge)
15) Rutherford's model
Atom is mostly empty space, with electrons orbiting a fixed, positively charged core called a nucleus. electrons is moving round the nucleus. It’s energy should increase. Therefore velocity should decrease continuously .i.e the electron come closer and closer to the nucleus until it collapses. It’s fail to explain the stability of atoms
Bohr model
The atom consists of positively charged nucleus with electron s revolving around it.
Electron can moving around the nucleus only in certain definite orbits
17) Nitrogen, phosphorus both are group 15(Va) Nitrogen and phosphorus have similar properties due to p3 orbitals and same group
B, Al , C, O ,S least similar to nitrogen due to different electronic configuration and groups
a
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