QUESTIONNARIE TOPIC 3

Questionnaire

Activity 3

1.       ________________________proposed that matter was formed by tiny particles which he called atoms (from the greek words “a” = without; “tomos” = divide

2.       _______________________proposed what was known as the first atomic theory.

3.       the matter is formed by very small and indivisible particles called_____________

4.       Dalton’s atomic model is known as __________________________________-

5.       ___________________This person studied cathode ray tube, discovered that these were actually tiny negatively charged particles. These  particles were named _________________

6.       _________________ this person described one of the particles containing a positive charge that are now denominated ______________________

7.       ___________________ this person states that the atom contains a nucleus and this is very small in comparison with the size of the atom

8.       _________________ this person discovers the neutron that would also be located inside the nucleus.

9.       _____________________ this person  sustained that the electrons were constantly moving in “orbits” around the nucleus.

10.   Electrons are not found spinning randomly around the nucleus, instead they are located in specific levels of energy called ________________________________________

11.   The energy in each level is different; levels closer to the nucleus have ____________energy, and the energy ________________ as the levels are farther from the nucleus.

12.   Electrons are in constant motion around the nucleus in such levels of energy. This state is known as the __________________________________

13.   If an atom receives enough energy, the electrons can jump to superior levels of energy; this state is called ___________________________________

14.   The ___________________________________ includes a spectrum of energy having different frequencies and wavelengths.

15.   According to these parameters it is manifested as:

16.   These are the three basic particles in an atom:

17.   The _____________________________ is defined as the number of protons inside the nucleus of an atom.

18.   Chlorine atoms having different number of neutrons must have different masses. Atoms of a particular element having different masses are called ________________

19.   According to the charge of the particles, write what kind of charge have each of the three basic particles of the atom.