They are inversely related: $$c = \lambda \nu$$

Question 1

Which of the following best explains why hydrogen is highly reactive compared to helium?

Accepted Answer

Hydrogen has a single electron in its outermost shell, making it eager to gain or lose an electron to achieve stability.

Question 2

According to the periodic law, when elements are arranged in order of increasing atomic number, certain sets of properties:

Accepted Answer

Occur periodically.

Question 3

Which model of the atom first introduced the concept of quantized energy levels for electrons?

Accepted Answer

Bohr model

Question 4

Light is described as having both wave-like and particle-like properties. What is the term for a particle of light?

Accepted Answer

Photon

Question 5

Which of the following types of electromagnetic radiation has the shortest wavelength and highest energy?

Accepted Answer

Gamma rays

Question 6

A red shirt appears red because:

Accepted Answer

It reflects red light and absorbs all other colors.

Question 7

What is the relationship between wavelength ($$\lambda) $$and frequency ($$
u) of $$light?

Accepted Answer

They are inversely related: $$c = \lambda 
u$$

Question 8

Arrange the following types of electromagnetic radiation in order of increasing energy per photon: microwaves, visible light, X-rays.

Accepted Answer

Microwaves \u003c Visible light \u003c X-rays

Question 9

Which formula would you use to calculate the energy of a photon given its wavelength?

Accepted Answer

$$E = \frac{hc}{\lambda}$$

Question 10

A hydrogen atom emits a photon with a wavelength of 486 nm. Which electron transition does this correspond to?

Accepted Answer

From $$n=4 to$$ $$n=2$$

Question 11

Which of the following statements about electron configurations is TRUE?

Accepted Answer

Electrons fill lower-energy orbitals before higher-energy orbitals.

Question 12

How many valence electrons does silicon (Si) have?

Accepted Answer

4

Question 13

Which principle states that orbitals may hold no more than two electrons with opposing spins?

Accepted Answer

Pauli exclusion principle

Question 14

What is the electron configuration for a ground-state carbon atom?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^2$$

Question 15

Which of the following best describes the trend in atomic size across a period (left to right) in the periodic table?

Accepted Answer

Atomic size decreases due to increasing nuclear charge.

Question 16

Which element would have the highest ionization energy?

Accepted Answer

Helium

Question 17

Which of the following is true about metallic character in the periodic table?

Accepted Answer

It increases as you move down a group and decreases as you move across a period.

Question 18

Which orbital is higher in energy in a multi-electron atom: 4s or 3d?

Accepted Answer

3d

Question 19

Which of the following electron configurations represents a noble gas?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^6$$

Question 20

A sodium atom (Na) has the following noble gas core notation for its electron configuration:

Accepted Answer

$$[Ne] 3s^1$

Electrons in Atoms and the Periodic Table: Structured Study Notes

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