元素代号
K
L
M
Q
R
T
N
原子半径/nm
0.183
0.160
0.143
0.102
0.089
0.074
0.152
主要化合价
+1
+2
+3
+6、﹣2
﹣2
下列叙述正确的是( )
A:K,L,M三元素的金属性逐渐增强
B:在RCl2分子中,各原子均满足8电子的稳定结构
C:Q元素的最高价氧化物为电解质,其水溶液能够导电
D:K在T单质中燃烧所形成的化合物中含有非极性共价键和离子键
I
⑴What's that in English? ____
⑵What color is the pen? ____
⑶How are you? ____
⑷Who's the girl? ____
⑸He's my brother, Jack. ____
⑹Is he your friend? ____
⑺Good evening, Bob! ____
⑻Where's your key? ____
⑼Are these Dale's cards? ____
⑽Have a good day! ____
II
A.Yes, they are.
B.I'm fine, thanks
C.On the book.
D.It's a ruler.
E.Good evening!
F.She is Kate.
G.No, he isn't.
H.It's black.
I.You, too.
J.Oh, I see.
左右匹配。
(____)1. long hair A. 你是对的。
(____)2. you're right B. 长头发
(____)3. short and strong C. 一个英国男孩
(____)4. an English boy D. 蓝色的大眼睛
(____)5. big blue eyes E. 又矮又壮