Test - Atomic Structure

Question 1

6. The atomic number of magnesium is 12. Therefore it’s nucleus must contain.

Answer 1

6 protons and 6 electrons

Question 2

13. The total number of electrons in the outer shell of a sodium atom is

Answer 2

1

Question 3

14. Which particles determine the atomic number of an element

Answer 3

Protons only

Question 4

15. The total number f neutrons in the nucleus of any atom is equal to

Answer 4

Mass number minus the atomic number

Question 5

23. The nucleus of isotopes A of an element has a larger mass than isotope of the same element. The number of neutrons in the nucleus of isotope A is _______ the number of neutrons in the nucleus of isotope B.

Answer 5

Greater than

Question 6

30. Which of the following elements would be the best conductors of electricity

Answer 6

Silver

Question 7

32. Which of the following elements would be the least reactive

Answer 7

Silicon

Question 8

39. Electron Cloud Model; surrounding the nucleus is an electron cloud made of shells - electrons do not, however,travel in a fixed orbit

Answer 8

Shrodinger and Heisenberg

Question 9

40. Nuclear model gold foil experiment allowed him to discover that the nucleus was positively charged center of the Adam surround by negatively charged electrons

Answer 9

Ernest Rutherford

Question 10

41. Arranged the elements on the periodic table based on atomic mass

Answer 10

Dmitri Mendeleev

Question 11

46. In each. How does the number of electrons in each kind of Adam change from left to right between Groups One and to explain how you know

Answer 11

Adams electron increase by 1 be protons increases by one

Question 12

51. An isotope of Carbon has 7 neutrons. A write this isotopes notation in nuclear form. B write this isotopes notation in hyphen form. C is this the most common form of the isotope? Explain how you know if it is or isn’t

Answer 12

7c, carbon - 7, No because avg atomic mass is 12.011 on PT