The electronic configurations of three elements X, Y, and Z are X - 2,8; Y - 2, 8, 7 and Z - 2, 8, 2. Which of the following is correct?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
Correct Answer: (d) Y is a non-metal and Z is a metal
Explanation: According to the electronic configuration given above, Y is chlorine (non-metal) and Z is Magnesium (metal).
Related Articles
- A non-metal X exists in two different forms Y and Z. Y is the hardest natural substance, whereas Z is a good conductor of electricity. Identify X, Y and Z.
- Factorise:(i) \( 4 x^{2}+9 y^{2}+16 z^{2}+12 x y-24 y z-16 x z \)(ii) \( 2 x^{2}+y^{2}+8 z^{2}-2 \sqrt{2} x y+4 \sqrt{2} y z-8 x z \)
- Subtract $3 x y+5 y z-7 z x$ from $5 x y-2 y z-2 z x+10 x y z$.
- If \( a^{x}=b^{y}=c^{z} \) and \( b^{2}=a c \), then show that \( y=\frac{2 z x}{z+x} \).
- A student dipped the strip of metal X in a blue coloured salt solution YSO4. After some time, a layer of metal Y from the salt solution is formed on the surface of metal strip X. Metal X is used in galvanisation whereas metal Y is used in making electric wires. Metals X and Y together form an alloy Z. (a) What could be (a) metal X, and (ii) metal Y? (b) Name the metal salt YSO4. Write its chemical formula (c) What type of chemical reaction takes place when metal X reacts with salt solution YSO4. (d) Name the alloy Z.
- A strip of metal X is dipped in a blue coloured salt solution YSO4. After some time, a layer of metal Y from the salt solution is formed on the surface of metal strip X. Metal X is used in galvanisation whereas metal Y is used in making electric wires. Metal X and metal Y together form an alloy Z.(a) What could metal X be?(b) What could metal Y be?(c) Name the metal salt YSO4.(d) What type of chemical reaction takes place when metal X reacts with salt solution YSO4? Write the equation of the chemical reaction involved.(e) Name the alloy Z.
- Verify that \( x^{3}+y^{3}+z^{3}-3 x y z=\frac{1}{2}(x+y+z)\left[(x-y)^{2}+(y-z)^{2}+(z-x)^{2}\right] \)
- Add: $20 x^{2} y^{2} z and -10 x^{2} y^{2} z$
- Simplify each of the following expressions:\( (x+y-2 z)^{2}-x^{2}-y^{2}-3 z^{2}+4 x y \)
- Verify the property \( x \times(y+z)=(x \times y)+(x \times z) \) for the given values of \( x,\ y \) and \( z \).\( x=\frac{-5}{2}, y=\frac{1}{2} \) and \( z=-\frac{10}{7} \)>
- Factorise:\( 4 x^{2}+9 y^{2}+16 z^{2}+12 x y-24 y z-16 x z \)
- Find the following products:\( \frac{-8}{27} x y z\left(\frac{3}{2} x y z^{2}-\frac{9}{4} x y^{2} z^{3}\right) \)
- If $x=1,\ y=2$ and $z=5$, find the value of $x^{2}+y^{2}+z^{2}$.
- Find the products of the following monomials.a. \( (-6) x^{2} \times 7 x y \)b. \( 2 a b \times(-6) a b \)c. \( \left(-4 x^{2} y^{2}\right) \times 3 x^{2} y^{2} \)d. \( 9 x y z \times 2 z^{3} \)
- Find the product of $(-3 x y z)(\frac{4}{9} x^{2} z)(-\frac{27}{2} x y^{2} z)$ and verify the result for ; $x=2, y=3$ and $z=-1$
Kickstart Your Career
Get certified by completing the course
Get Started