Chemistry

periodic table

名词

/pˌiəɹɪˈɑːdɪk tˈeɪbəl/

(元素周期表)

周期表

a tabular arrangement of chemical elements organized based on their atomic number, electron configuration, and recurring chemical properties

isotope

名词

/aɪ.sə.toʊp/ or /ai.sē.tooop/

i

aɪ

s

s

o

ə

t

t

o

oʊ

p

p

e

(同素异形体)

同位素

each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, leading to variation in atomic mass

halogen

名词

/hæ.lə.ʤən/ or /hā.lē.jēn/

h

h

a

æ

l

l

o

ə

g

ʤ

e

ə

n

n

(卤族元素)

卤素

a type of chemical element found in Group 17 of the periodic table, known for being highly reactive and commonly used in disinfectants and lights

noble gas

名词

/nˈoʊbəl ɡˈæs/

(贵气体)

惰性气体

any of the elements in Group 18 of the periodic table, including helium, neon, argon, krypton, xenon, and radon, characterized by their inert nature and stable electron configurations

emulsion

名词

/ɪ.məl.ʃən/ or /i.mēl.shēn/

e

ɪ

m

m

u

ə

l

l

s

ʃ

io

ə

n

n

(乳剂)

乳化液

a mixture of two liquids where tiny droplets of one are evenly dispersed in the other, like oil in water

half-life

名词

/hˈæf lˈaɪf/

(半生期)

半衰期

the time required for half of a quantity of a substance to undergo a change or decay, typically in the context of radioactive decay or chemical reactions

radioactivity

名词

/reɪ.dioʊ.æk.tɪ.vɪ.ti/ or /rei.diooo.āk.ti.vi.ti/

r

r

a

eɪ

d

d

ioa

ioʊæ

c

k

t

t

i

ɪ

v

v

i

ə

t

t

y

i

(辐射性)

放射性

the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei in radioactive substances

depleted uranium

名词

/dɪplˈiːɾᵻd jʊɹˈeɪniəm/

(耗尽铀)

贫铀

a type of uranium that has most of its more radioactive isotopes removed, primarily used for armor-piercing ammunition and shielding