27.Which social networking platform gas banned around 2 million Indian accounts in the recent 1 month period?

[A] Facebook
[B] WhatsApp
[C] Twitter
[D] Instagram

• Does it seem likely that she might be compressing nerves in the area between the acromion and the humerus?

1. Which of the following elements would have similar properties to Sulfur?

a. Chlorine b. Argon c. Aluminum d. Oxygen

2. Which element is likely to react violently with water (Hint: think back to the demo you saw!)?

a. Beryllium b. Carbon c. Caesium d. Sulfur

3. Which element is most likely to be a clear, colourless, odourless gas that is unreactive?

a. Fluorine b. Krypton c. Nitrogen d. Hydrogen

4. Which statement is correct?

a. Be is more reactive than Li c. O is more reactive than F

b. Kr is more reactive than Br d. Ra is more reactive than Be

5. Which of the following are true about the Alkaline Earth metals?

a. They all have 2 electrons in their valence shell

b. They are the most reactive group of metals

c. They burn with bright colourful flames, and are used in fireworks

d. All of the above are true

e. Only a. and c. are true

6. Rutherford’s gold foil experiment showed that…

a. electrons do not surround the nucleus in a random cloud, but rather in organized orbitals

b. atoms have a tiny, positively charged nucleus

c. electrons crowd tightly together at an atom’s centre

d. atoms contain neutrons

7. Which determines the identity of an atom?

a. the sum of protons and neutrons c. number of neutrons

b. number of protons in the nucleus d. its driver’s license

8. If an atom has six protons, six electrons, and eight neutrons it must be an isotope of…

a. carbon b. silicon c. oxygen d. magnesium

9. An atom has a mass number of 20 and it contains 10 neutrons. What element must it be?

a. calcium b. neon c. zinc d. More information is needed.

10. Which of the following statements is correct?

a. Protons and electrons are located in the nucleus of an atom.

b. All atoms of the element lithium will have 4 neutrons.

c. The energy level closest to the nucleus is the valence shell.

d. Two atoms of the same element can have different numbers of neutrons.

11. Which phrase best describes a group or family in the periodic table?

a. Elements that have the same melting point.

b. Elements that have the same number of electrons in their outermost orbits.

c. Elements in the same group all have the same number of orbitals/energy levels.

d. Elements that are in the same row.