Metalloids

Q.

What are Metalloids?

Q.

Is Aluminium a metal or a metalloid?

Q.

How many metals, metalloids and nonmetals are there in the third period of the periodic table?

Q.

List the metalloids elements.

Q. What is the name given to an element that exhibits properties of both metals and nonmetals?

1. Alloy
2. Steel
3. All of the above.
4. Metalloid

Q.

Give two examples of metals

Q.

Which of the following is a metalloid?

1. Fluorine

2. Silicon

3. Iodine

4. Aluminium

Q. Three elements B, Si and Ge are

1. Metals
2. Non-metals
3. Metalloids
4. Metal, non-metal and metalloid respectively

Q.

What is Group 10 on the periodic table called?

Q.

State the common characteristic of the following elements: Boron, Silicon, Germanium and Arsenic

Q. What is an element? How are elements classified?

Q.

Solid $\mathrm{NaCl}$ is a bad conductor of electricity because:

1. in solid $\mathrm{NaCl}$, there are no electrons

2. in solid $\mathrm{NaCl}$, ions cannot move freely

3. in solid-state, there are no ions

4. none of the above

Q.

What is the meaning of lanthanides?

Q. Identify metalloids from the following-

1. Bromine
2. Aluminium
3. Silicon
4. Germanium

Q.

Write a note on metals, Nonmetals, Metalloids, and noble gases.

Q.

Which one of the following is not a metalloid ?

(a) boron (b) silicon (c) gallium (d) germanium

Q.

Metalloids are elements that have properties of:

1. Metals

2. Non-metals

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3. Some metals and some non-metals

4. None of the above

Q. A student is given a sample of an unknown substance. He is asked to determine if it is classified as a metal, a metalloid, or a nonmetal. He discovered that the unknown element forms amphoteric oxides and often behave as semiconductors. This element is most likely a ________.

1. metal
2. non-metal
3. metalloid
4. cannot be determined

Q.

Most of the elements found on Earth are in _________ state.

1. plasma
2. solid
3. liquid
4. gaseous

Q.

Nitrogen is a

1. Halogen

2. Noble Gas

3. Alkaline earth

4. Non metal

Q.

________ have properties intermediate between those of metals and non-metals.

Q.

The properties of _________ are ductility and mallebility.
__________ are poor conductors of heat and electricity.
__________ has intermediate properties.

1. non-metals, metalloids, metals

2. metals, metalloids, non-metals

3. non-metals, metals, metalloids

4. metals, non-metals, metalloids

Q.

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium.
How many valence electrons are present in each one of them?

1. Eka-aluminium is galium (Ga) contains 1 valence electrons
   Eka-silicon is germanium (Ge) contains 2 valence electrons

2. Eka-aluminium is galium (Ga) contains 5 valence electrons
   Eka-silicon is germanium (Ge) contains 6 valence electrons

3. Eka-aluminium is galium (Ga) contains 3 valence electrons
   Eka-silicon is germanium (Ge) contains 4 valence electrons

4. Eka-aluminium is galium (Ga) contains 4 valence electrons
   Eka-silicon is germanium (Ge) contains 5 valence electrons

Q.

What name is given to those elements which are neither good conductors of electricity like copper nor insulators like sulphur ?

Q.

Name three elements which behave as metalloids.

Q.

List four properties of nonmetals. Give two examples of nonmetals.

Q. Question 48 (d)
(a) Electropositive nature of the element(s) increases down the group and decreases across the period
(b) Electronegativity of the element decreases down the group and increases across the period
(c) Atomic size increases down the group and decreases across a period (left to right)
(d) Metallic character increases down the group and decreases across a period.
On the basis of the above trends of the Periodic Table, answer the following about the elements with atomic numbers 3 to 9.

Name the element which is a metalloid.

Q.

One of the following substances is neither a good conductor of electricity nor an insulator. This substance is ?

(a) chromium (b) germanium (c) gallium (d) potassium

Q. Name a compound made with one element as a noble gas.

Q. What is an element? How are elements classified?