chemistry

Period 3 is the ___________________ row in the Periodic Table

• vertical

• horizontal

if the element at 7 valence electrons and 3 shells filled with electrons, What is the position of the element in the Periodic Table?

• Period 7 Group 3

• Period 7 Group 13

• Period 3 Group 7

• Period 3 Group 17

Element M is placed in Group 14 and Period 3 of the Periodic Table. What is the electron arrangement of an atom M?

• 2.3

• 2.4

• 2.8.3

• 2.8.4

Table 2 shows the relative atomic masses and number of neutrons for the elements G and J. G and J are not the actual symbols of the elements.

Which of the following statements are true about these elements?

I Element G is more reactive than element J.

II Atoms G and J have two valence electrons.

III Elements G and J are in the same group in the Periodic Table.

IV Elements G and J can conduct electricity.

• I and II

• I and III

• II and IV

• III and IV

Neon gas is used to provide an inert atmosphere for welding. Which of the following explains this property of neon?

• It has a stable electron

  arrangement

• It is placed in Group 18 of the

  Periodic Table

• It exists as monoatomic gas

• It has low melting and boiling

  points

Element G, J, and L are located in Group 17 of the Periodic Table. Atomic radius of element J is the smallest. In an experiment, when vapour L is passed over hot iron wool, the iron wool glows brightly. When vapour G is passed over hot iron wool, the iron wool glows dimly. The reactivity of elements G, J, and L in ascending order is ...

• L, G, J

• G, L, J

• G, J, L

• J, L, G

Table 3 shows the nucleon number and number of neutrons for elements W, X, Y and Z.

• W

• X

• Y

• Z

Which characteristic is correct for the elements according to the sequence as shown below?

• Solubility in water increases

• Reactivity increases

• Electrical conductivity increases

• The strength to accept an electron decreases